diff --git a/backend-single/src/main/java/com/emotion/controller/TtsController.java b/backend-single/src/main/java/com/emotion/controller/TtsController.java
index 02fefa0..d1284f2 100644
--- a/backend-single/src/main/java/com/emotion/controller/TtsController.java
+++ b/backend-single/src/main/java/com/emotion/controller/TtsController.java
@@ -61,8 +61,11 @@ public class TtsController {
     @GetMapping("/tasks/by-source")
     public Result<TtsTaskResponse> bySource(@Parameter(description = "来源类型") @RequestParam String sourceType,
                                             @Parameter(description = "来源 ID") @RequestParam String sourceId,
-                                            @Parameter(description = "音色") @RequestParam(required = false) String voice) {
-        return Result.success(ttsTaskService.getBySource(sourceType, sourceId, voice));
+                                            @Parameter(description = "音色") @RequestParam(required = false) String voice,
+                                            @Parameter(description = "语速") @RequestParam(required = false) Double speechRate,
+                                            @Parameter(description = "音调") @RequestParam(required = false) Double pitch,
+                                            @Parameter(description = "情绪") @RequestParam(required = false) String emotion) {
+        return Result.success(ttsTaskService.getBySource(sourceType, sourceId, voice, speechRate, pitch, emotion));
     }
 
     @Operation(summary = "获取音频文件", description = "返回已合成的音频音频文件（MP3 或 WAV 格式）。")
diff --git a/backend-single/src/main/java/com/emotion/dto/request/tts/TtsTaskCreateRequest.java b/backend-single/src/main/java/com/emotion/dto/request/tts/TtsTaskCreateRequest.java
index 0577ce4..83b6aef 100644
--- a/backend-single/src/main/java/com/emotion/dto/request/tts/TtsTaskCreateRequest.java
+++ b/backend-single/src/main/java/com/emotion/dto/request/tts/TtsTaskCreateRequest.java
@@ -3,6 +3,8 @@ package com.emotion.dto.request.tts;
 import lombok.Data;
 
 import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.DecimalMax;
+import javax.validation.constraints.DecimalMin;
 import javax.validation.constraints.Size;
 
 @Data
@@ -18,4 +20,15 @@ public class TtsTaskCreateRequest {
 
     @Size(max = 64)
     private String voice;
+
+    @DecimalMin("0.60")
+    @DecimalMax("1.40")
+    private Double speechRate;
+
+    @DecimalMin("-20.00")
+    @DecimalMax("20.00")
+    private Double pitch;
+
+    @Size(max = 32)
+    private String emotion;
 }
diff --git a/backend-single/src/main/java/com/emotion/dto/response/tts/TtsTaskResponse.java b/backend-single/src/main/java/com/emotion/dto/response/tts/TtsTaskResponse.java
index 309e9a5..b17d1f9 100644
--- a/backend-single/src/main/java/com/emotion/dto/response/tts/TtsTaskResponse.java
+++ b/backend-single/src/main/java/com/emotion/dto/response/tts/TtsTaskResponse.java
@@ -12,6 +12,9 @@ public class TtsTaskResponse {
     private String sourceId;
     private String status;
     private String voice;
+    private Double speechRate;
+    private Double pitch;
+    private String emotion;
     private String audioUrl;
     private Long durationMs;
     private String errorMessage;
diff --git a/backend-single/src/main/java/com/emotion/service/TtsEngineClient.java b/backend-single/src/main/java/com/emotion/service/TtsEngineClient.java
index f1dc82a..7441cb2 100644
--- a/backend-single/src/main/java/com/emotion/service/TtsEngineClient.java
+++ b/backend-single/src/main/java/com/emotion/service/TtsEngineClient.java
@@ -2,7 +2,37 @@ package com.emotion.service;
 
 public interface TtsEngineClient {
 
-    TtsEngineResult synthesize(String text, String voice, String outputPath);
+    TtsEngineResult synthesize(String text, String voice, String outputPath, SynthesisOptions options);
+
+    class SynthesisOptions {
+        private final Double speechRate;
+        private final Double pitch;
+        private final String emotion;
+
+        public SynthesisOptions(Double speechRate, Double pitch, String emotion) {
+            this.speechRate = speechRate;
+            this.pitch = pitch;
+            this.emotion = emotion;
+        }
+
+        public Double getSpeechRate() {
+            return speechRate;
+        }
+
+        public Double getPitch() {
+            return pitch;
+        }
+
+        public String getEmotion() {
+            return emotion;
+        }
+
+        public String cacheKey() {
+            return "rate=" + (speechRate == null ? "" : speechRate)
+                    + ";pitch=" + (pitch == null ? "" : pitch)
+                    + ";emotion=" + (emotion == null ? "" : emotion);
+        }
+    }
 
     class TtsEngineResult {
         private final boolean success;
diff --git a/backend-single/src/main/java/com/emotion/service/TtsTaskService.java b/backend-single/src/main/java/com/emotion/service/TtsTaskService.java
index 3f629cc..a218d87 100644
--- a/backend-single/src/main/java/com/emotion/service/TtsTaskService.java
+++ b/backend-single/src/main/java/com/emotion/service/TtsTaskService.java
@@ -11,5 +11,6 @@ public interface TtsTaskService extends IService<TtsTask> {
 
     TtsTaskResponse getTask(String id);
 
-    TtsTaskResponse getBySource(String sourceType, String sourceId, String voice);
+    TtsTaskResponse getBySource(String sourceType, String sourceId, String voice,
+                                Double speechRate, Double pitch, String emotion);
 }
diff --git a/backend-single/src/main/java/com/emotion/service/impl/HttpTtsEngineClient.java b/backend-single/src/main/java/com/emotion/service/impl/HttpTtsEngineClient.java
index 18aed35..227a3e5 100644
--- a/backend-single/src/main/java/com/emotion/service/impl/HttpTtsEngineClient.java
+++ b/backend-single/src/main/java/com/emotion/service/impl/HttpTtsEngineClient.java
@@ -5,7 +5,9 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 import org.springframework.web.client.RestTemplate;
+import org.springframework.util.StringUtils;
 
+import java.util.HashMap;
 import java.util.Map;
 
 @Service
@@ -21,13 +23,23 @@ public class HttpTtsEngineClient implements TtsEngineClient {
     }
 
     @Override
-    public TtsEngineResult synthesize(String text, String voice, String outputPath) {
+    public TtsEngineResult synthesize(String text, String voice, String outputPath, SynthesisOptions options) {
         try {
-            Map<String, Object> body = Map.of(
-                    "text", text,
-                    "voice", voice,
-                    "outputPath", outputPath
-            );
+            Map<String, Object> body = new HashMap<>();
+            body.put("text", text);
+            body.put("voice", voice);
+            body.put("outputPath", outputPath);
+            if (options != null) {
+                if (options.getSpeechRate() != null) {
+                    body.put("speechRate", options.getSpeechRate());
+                }
+                if (options.getPitch() != null) {
+                    body.put("pitch", options.getPitch());
+                }
+                if (StringUtils.hasText(options.getEmotion())) {
+                    body.put("emotion", options.getEmotion());
+                }
+            }
             ResponseEntity<Map> response = restTemplate.postForEntity(engineUrl + "/synthesize", body, Map.class);
             Map<?, ?> data = response.getBody();
             boolean success = data != null && Boolean.TRUE.equals(data.get("success"));
diff --git a/backend-single/src/main/java/com/emotion/service/impl/TtsTaskServiceImpl.java b/backend-single/src/main/java/com/emotion/service/impl/TtsTaskServiceImpl.java
index 5cd0c5a..5585d8c 100644
--- a/backend-single/src/main/java/com/emotion/service/impl/TtsTaskServiceImpl.java
+++ b/backend-single/src/main/java/com/emotion/service/impl/TtsTaskServiceImpl.java
@@ -19,6 +19,9 @@ import org.springframework.util.DigestUtils;
 import org.springframework.util.StringUtils;
 
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executor;
@@ -32,6 +35,10 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
     private static final String STATUS_PROCESSING = "processing";
     private static final String STATUS_SUCCESS = "success";
     private static final String STATUS_FAILED = "failed";
+    private static final double FALLBACK_SPEECH_RATE = 0.92D;
+    private static final double FALLBACK_PITCH = 0D;
+    private static final String FALLBACK_EMOTION = "story";
+    private static final int NATURAL_PARAGRAPH_LIMIT = 140;
 
     private final EpicScriptMapper epicScriptMapper;
     private final TtsEngineClient ttsEngineClient;
@@ -52,6 +59,15 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
     @Value("${emotion.tts.default-voice:default_zh_female}")
     private String defaultVoice;
 
+    @Value("${emotion.tts.default-speech-rate:0.92}")
+    private double defaultSpeechRate;
+
+    @Value("${emotion.tts.default-pitch:0}")
+    private double defaultPitch;
+
+    @Value("${emotion.tts.default-emotion:story}")
+    private String defaultEmotion;
+
     public TtsTaskServiceImpl(EpicScriptMapper epicScriptMapper,
                               TtsEngineClient ttsEngineClient,
                               @Qualifier("taskExecutor") Executor taskExecutor) {
@@ -70,15 +86,16 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
         String sourceType = normalizeSourceType(request.getSourceType());
         String sourceId = request.getSourceId().trim();
         String voice = resolveVoice(request.getVoice());
+        TtsEngineClient.SynthesisOptions options = resolveOptions(request);
         String cleaned = cleanText(loadSourceText(userId, sourceType, sourceId));
         if (!StringUtils.hasText(cleaned)) {
             throw new IllegalArgumentException("Source text is empty");
         }
         if (cleaned.length() > maxTextLength) {
-            cleaned = cleaned.substring(0, maxTextLength);
+            cleaned = limitReadableText(cleaned, maxTextLength);
         }
 
-        String hash = DigestUtils.md5DigestAsHex((voice + "\n" + cleaned).getBytes(StandardCharsets.UTF_8));
+        String hash = DigestUtils.md5DigestAsHex((voice + "\n" + options.cacheKey() + "\n" + cleaned).getBytes(StandardCharsets.UTF_8));
         TtsTask owned = findOwnedTask(userId, sourceType, sourceId, voice, hash);
         if (owned != null) {
             incrementRequestCount(owned);
@@ -100,7 +117,7 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
         TtsTask task = buildTask(userId, sourceType, sourceId, voice, hash, cleaned.length());
         save(task);
         String synthesisText = cleaned;
-        CompletableFuture.runAsync(() -> process(task.getId(), synthesisText, voice, task.getAudioPath()), taskExecutor);
+        CompletableFuture.runAsync(() -> process(task.getId(), synthesisText, voice, task.getAudioPath(), options), taskExecutor);
         return toResponse(task);
     }
 
@@ -115,20 +132,22 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
     }
 
     @Override
-    public TtsTaskResponse getBySource(String sourceType, String sourceId, String voice) {
+    public TtsTaskResponse getBySource(String sourceType, String sourceId, String voice,
+                                       Double speechRate, Double pitch, String emotion) {
         String userId = currentUserId();
-        TtsTask task = getOne(new LambdaQueryWrapper<TtsTask>()
-                .eq(TtsTask::getUserId, userId)
-                .eq(TtsTask::getSourceType, normalizeSourceType(sourceType))
-                .eq(TtsTask::getSourceId, sourceId)
-                .eq(TtsTask::getVoice, resolveVoice(voice))
-                .eq(TtsTask::getIsDeleted, 0)
-                .orderByDesc(TtsTask::getCreateTime)
-                .last("LIMIT 1"));
+        String normalizedSourceType = normalizeSourceType(sourceType);
+        String normalizedVoice = resolveVoice(voice);
+        TtsEngineClient.SynthesisOptions options = resolveOptions(speechRate, pitch, emotion);
+        String cleaned = cleanText(loadSourceText(userId, normalizedSourceType, sourceId));
+        if (cleaned.length() > maxTextLength) {
+            cleaned = limitReadableText(cleaned, maxTextLength);
+        }
+        String hash = DigestUtils.md5DigestAsHex((normalizedVoice + "\n" + options.cacheKey() + "\n" + cleaned).getBytes(StandardCharsets.UTF_8));
+        TtsTask task = findOwnedTask(userId, normalizedSourceType, sourceId, normalizedVoice, hash);
         return task == null ? null : toResponse(task);
     }
 
-    private void process(String taskId, String text, String voice, String outputPath) {
+    private void process(String taskId, String text, String voice, String outputPath, TtsEngineClient.SynthesisOptions options) {
         try {
             TtsTask task = getById(taskId);
             if (task == null) {
@@ -138,7 +157,7 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
             task.setErrorMessage(null);
             updateById(task);
 
-            TtsEngineClient.TtsEngineResult result = ttsEngineClient.synthesize(text, voice, outputPath);
+            TtsEngineClient.TtsEngineResult result = ttsEngineClient.synthesize(text, voice, outputPath, options);
             task = getById(taskId);
             if (task == null) {
                 return;
@@ -220,13 +239,15 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
 
         StringBuilder text = new StringBuilder();
         append(text, script.getTitle());
-        append(text, script.getPlotIntro());
-        append(text, script.getPlotTurning());
-        append(text, script.getPlotClimax());
-        append(text, script.getPlotEnding());
         Map<String, Object> plotJson = script.getPlotJson();
-        if (plotJson != null && plotJson.get("fullContent") != null) {
-            append(text, String.valueOf(plotJson.get("fullContent")));
+        Object fullContent = plotJson == null ? null : plotJson.get("fullContent");
+        if (fullContent != null && StringUtils.hasText(String.valueOf(fullContent))) {
+            append(text, String.valueOf(fullContent));
+        } else {
+            append(text, script.getPlotIntro());
+            append(text, script.getPlotTurning());
+            append(text, script.getPlotClimax());
+            append(text, script.getPlotEnding());
         }
         return text.toString();
     }
@@ -235,9 +256,39 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
         if (text == null) {
             return "";
         }
-        return text.replaceAll("[#>*_`\\-]", "")
-                .replaceAll("\\s+", " ")
-                .trim();
+        String normalized = text.replace("\r\n", "\n")
+                .replace('\r', '\n')
+                .replaceAll("!\\[[^\\]]*]\\([^)]*\\)", "")
+                .replaceAll("\\[([^\\]]+)]\\([^)]*\\)", "$1")
+                .replaceAll("(?m)^\\s{0,3}#{1,6}\\s*", "")
+                .replaceAll("(?m)^\\s*>\\s?", "")
+                .replaceAll("(?m)^\\s*[-*+]\\s+", "")
+                .replaceAll("(?m)^\\s*\\d+[.)、]\\s+", "")
+                .replaceAll("<[^>]+>", "")
+                .replaceAll("[*_`~]", "")
+                .replaceAll("[“”]", "\"")
+                .replaceAll("[‘’]", "'")
+                .replaceAll("\\.{3,}", "……")
+                .replaceAll("-{2,}", "，")
+                .replaceAll("[\\t\\u00A0]+", " ")
+                .replaceAll(" {2,}", " ")
+                .replaceAll("(?<=[\\p{IsHan}])[ \\t\\u00A0]+(?=[\\p{IsHan}])", "")
+                .replaceAll("[ \\t\\u00A0]*([，。！？；：、,.!?;:])[ \\t\\u00A0]*", "$1")
+                .replaceAll(",", "，")
+                .replaceAll("!", "！")
+                .replaceAll("\\?", "？")
+                .replaceAll(";", "；")
+                .replaceAll(":", "：");
+
+        List<String> paragraphs = new ArrayList<>();
+        for (String paragraph : normalized.split("\\n+")) {
+            String trimmed = paragraph.trim();
+            if (!StringUtils.hasText(trimmed)) {
+                continue;
+            }
+            paragraphs.addAll(toReadableParagraphs(trimmed));
+        }
+        return String.join("\n\n", paragraphs).trim();
     }
 
     private TtsTaskResponse toResponse(TtsTask task) {
@@ -253,6 +304,23 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
                 .build();
     }
 
+    private TtsEngineClient.SynthesisOptions resolveOptions(TtsTaskCreateRequest request) {
+        return resolveOptions(request.getSpeechRate(), request.getPitch(), request.getEmotion());
+    }
+
+    private TtsEngineClient.SynthesisOptions resolveOptions(Double requestSpeechRate, Double requestPitch, String requestEmotion) {
+        double speechRate = requestSpeechRate == null ? defaultOrFallback(defaultSpeechRate, FALLBACK_SPEECH_RATE) : requestSpeechRate;
+        double pitch = requestPitch == null ? defaultPitch : requestPitch;
+        String emotion = StringUtils.hasText(requestEmotion)
+                ? requestEmotion.trim()
+                : (StringUtils.hasText(defaultEmotion) ? defaultEmotion.trim() : FALLBACK_EMOTION);
+        return new TtsEngineClient.SynthesisOptions(
+                round(clamp(speechRate, 0.60D, 1.40D)),
+                round(clamp(pitch, -20D, 20D)),
+                emotion.toLowerCase(Locale.ROOT)
+        );
+    }
+
     private String currentUserId() {
         String userId = UserContextHolder.getCurrentUserId();
         if (!StringUtils.hasText(userId)) {
@@ -275,6 +343,91 @@ public class TtsTaskServiceImpl extends ServiceImpl<TtsTaskMapper, TtsTask> impl
         }
     }
 
+    private static List<String> toReadableParagraphs(String paragraph) {
+        List<String> parts = new ArrayList<>();
+        StringBuilder current = new StringBuilder();
+        for (int index = 0; index < paragraph.length(); index++) {
+            char ch = paragraph.charAt(index);
+            current.append(ch);
+            if (isHardSentenceEnd(ch) || (current.length() >= NATURAL_PARAGRAPH_LIMIT && isSoftPause(ch))) {
+                addReadablePart(parts, current);
+            }
+        }
+        addReadablePart(parts, current);
+        return parts;
+    }
+
+    private static void addReadablePart(List<String> parts, StringBuilder current) {
+        String value = current.toString().trim();
+        current.setLength(0);
+        if (!StringUtils.hasText(value)) {
+            return;
+        }
+        if (value.length() > NATURAL_PARAGRAPH_LIMIT + 40) {
+            splitLongText(parts, value);
+            return;
+        }
+        parts.add(ensureSentenceEnding(value));
+    }
+
+    private static void splitLongText(List<String> parts, String value) {
+        StringBuilder chunk = new StringBuilder();
+        for (int index = 0; index < value.length(); index++) {
+            char ch = value.charAt(index);
+            chunk.append(ch);
+            if (chunk.length() >= NATURAL_PARAGRAPH_LIMIT) {
+                parts.add(ensureSentenceEnding(chunk.toString().trim()));
+                chunk.setLength(0);
+            }
+        }
+        if (chunk.length() > 0) {
+            parts.add(ensureSentenceEnding(chunk.toString().trim()));
+        }
+    }
+
+    private static String ensureSentenceEnding(String value) {
+        if (!StringUtils.hasText(value)) {
+            return "";
+        }
+        char last = value.charAt(value.length() - 1);
+        return isHardSentenceEnd(last) || isSoftPause(last) ? value : value + "。";
+    }
+
+    private static boolean isHardSentenceEnd(char ch) {
+        return ch == '。' || ch == '！' || ch == '？' || ch == '；' || ch == '…';
+    }
+
+    private static boolean isSoftPause(char ch) {
+        return ch == '，' || ch == '、' || ch == '：';
+    }
+
+    private static String limitReadableText(String text, int limit) {
+        if (text.length() <= limit) {
+            return text;
+        }
+        String truncated = text.substring(0, limit);
+        int cut = Math.max(
+                Math.max(truncated.lastIndexOf('。'), truncated.lastIndexOf('！')),
+                Math.max(truncated.lastIndexOf('？'), truncated.lastIndexOf('\n'))
+        );
+        if (cut > limit * 0.75) {
+            return truncated.substring(0, cut + 1).trim();
+        }
+        return ensureSentenceEnding(truncated.trim());
+    }
+
+    private static double clamp(double value, double min, double max) {
+        return Math.max(min, Math.min(max, value));
+    }
+
+    private static double round(double value) {
+        return Math.round(value * 100D) / 100D;
+    }
+
+    private static double defaultOrFallback(double value, double fallback) {
+        return value <= 0D ? fallback : value;
+    }
+
     private static String joinPath(String prefix, String filename) {
         if (prefix.endsWith("/")) {
             return prefix + filename;
diff --git a/backend-single/src/main/resources/application-prod.yml b/backend-single/src/main/resources/application-prod.yml
index 9f0fd54..672b00a 100644
--- a/backend-single/src/main/resources/application-prod.yml
+++ b/backend-single/src/main/resources/application-prod.yml
@@ -69,6 +69,9 @@ emotion:
     public-url-prefix: /tts/audio
     max-text-length: 5000
     default-voice: default_zh_female
+    default-speech-rate: 0.92
+    default-pitch: 0
+    default-emotion: story
 
   # Speech-to-text config
   asr:
diff --git a/backend-single/src/main/resources/application.yml b/backend-single/src/main/resources/application.yml
index 60ed752..9fce6b9 100644
--- a/backend-single/src/main/resources/application.yml
+++ b/backend-single/src/main/resources/application.yml
@@ -106,6 +106,9 @@ emotion:
     public-url-prefix: /tts/audio
     max-text-length: 5000
     default-voice: default_zh_female
+    default-speech-rate: 0.92
+    default-pitch: 0
+    default-emotion: story
 
   # Speech-to-text config
   asr:
diff --git a/backend-single/src/test/java/com/emotion/service/TtsTaskServiceTest.java b/backend-single/src/test/java/com/emotion/service/TtsTaskServiceTest.java
index 231a97a..97ce6e1 100644
--- a/backend-single/src/test/java/com/emotion/service/TtsTaskServiceTest.java
+++ b/backend-single/src/test/java/com/emotion/service/TtsTaskServiceTest.java
@@ -12,11 +12,19 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 class TtsTaskServiceTest {
 
     @Test
-    @DisplayName("cleanText strips markdown and normalizes whitespace")
-    void cleanTextStripsMarkdownAndNormalizesWhitespace() {
-        String cleaned = TtsTaskServiceImpl.cleanText("# Title\n\n> **hello**   `world` - ok");
+    @DisplayName("cleanText strips markdown but keeps Chinese narration rhythm")
+    void cleanTextStripsMarkdownButKeepsChineseNarrationRhythm() {
+        String cleaned = TtsTaskServiceImpl.cleanText("# 第一章\n\n> **她 终于**  看见了自己\n\n- 转身离开");
 
-        assertEquals("Title hello world ok", cleaned);
+        assertEquals("第一章。\n\n她终于看见了自己。\n\n转身离开。", cleaned);
+    }
+
+    @Test
+    @DisplayName("cleanText preserves sentence punctuation for natural pauses")
+    void cleanTextPreservesSentencePunctuationForNaturalPauses() {
+        String cleaned = TtsTaskServiceImpl.cleanText("他说：  这一次，我想自己选择！\n\n你听见了吗？");
+
+        assertEquals("他说：这一次，我想自己选择！\n\n你听见了吗？", cleaned);
     }
 
     @Test
@@ -28,6 +36,9 @@ class TtsTaskServiceTest {
     @Test
     @DisplayName("TtsEngineResult exposes synthesis result fields")
     void ttsEngineResultExposesFields() {
+        TtsEngineClient.SynthesisOptions options = new TtsEngineClient.SynthesisOptions(0.92D, 0D, "story");
+        assertEquals("rate=0.92;pitch=0.0;emotion=story", options.cacheKey());
+
         TtsEngineClient.TtsEngineResult result =
                 new TtsEngineClient.TtsEngineResult(true, "/tmp/a.mp3", 1200L, null);
 
diff --git a/backend-single/tts-service/app.py b/backend-single/tts-service/app.py
index e6af167..35460ad 100644
--- a/backend-single/tts-service/app.py
+++ b/backend-single/tts-service/app.py
@@ -1,5 +1,6 @@
 import subprocess
 from pathlib import Path
+from typing import Optional
 
 from fastapi import FastAPI
 from pydantic import BaseModel, Field
@@ -16,6 +17,42 @@ class SynthesizeRequest(BaseModel):
     text: str = Field(min_length=1, max_length=5000)
     voice: str = "default_zh_female"
     outputPath: str
+    speechRate: Optional[float] = Field(default=0.92, ge=0.6, le=1.4)
+    pitch: Optional[float] = Field(default=0.0, ge=-20.0, le=20.0)
+    emotion: Optional[str] = "story"
+
+
+def clamp(value: float, minimum: float, maximum: float) -> float:
+    return max(minimum, min(maximum, value))
+
+
+def resolve_piper_args(request: SynthesizeRequest) -> list[str]:
+    speech_rate = clamp(float(request.speechRate or 0.92), 0.6, 1.4)
+    emotion = (request.emotion or "story").lower()
+    length_scale = round(1.0 / speech_rate, 2)
+    sentence_silence = 0.46
+    noise_scale = 0.64
+    noise_w = 0.72
+
+    if emotion in {"calm", "soft", "warm"}:
+        sentence_silence = 0.5
+        noise_scale = 0.58
+        noise_w = 0.68
+    elif emotion in {"story", "narration", "expressive"}:
+        sentence_silence = 0.48
+        noise_scale = 0.68
+        noise_w = 0.76
+
+    return [
+        "--sentence-silence",
+        str(sentence_silence),
+        "--length_scale",
+        str(length_scale),
+        "--noise_scale",
+        str(noise_scale),
+        "--noise_w",
+        str(noise_w),
+    ]
 
 
 @app.get("/health")
@@ -47,8 +84,7 @@ def synthesize(request: SynthesizeRequest):
                 str(PIPER_CONFIG),
                 "--output_file",
                 str(output),
-                "--sentence-silence",
-                "0.35",
+                *resolve_piper_args(request),
             ],
             input=request.text,
             text=True,