diff --git a/qwen3-tts-backend/core/audiobook_service.py b/qwen3-tts-backend/core/audiobook_service.py
index 5ef5802..d16dc60 100644
--- a/qwen3-tts-backend/core/audiobook_service.py
+++ b/qwen3-tts-backend/core/audiobook_service.py
@@ -1,6 +1,7 @@
 import asyncio
 import logging
 import re
+import shutil
 from pathlib import Path
 from typing import Optional
 
@@ -202,14 +203,18 @@ async def analyze_project(project_id: int, user: User, db: Session, turbo: bool
         samples = _sample_full_text(text)
         n = len(samples)
         
-        # Ensure previews directory is clean for new analysis
-        previews_dir = Path(settings.OUTPUT_DIR) / "audiobook" / str(project_id) / "previews"
-        if previews_dir.exists():
-            import shutil
-            try:
-                shutil.rmtree(previews_dir)
-            except Exception as e:
-                logger.warning(f"Failed to clear previews directory: {e}")
+        project_audio_dir = Path(settings.OUTPUT_DIR) / "audiobook" / str(project_id)
+        for subdir in ("previews", "segments", "chapters"):
+            d = project_audio_dir / subdir
+            if d.exists():
+                try:
+                    shutil.rmtree(d)
+                except Exception as e:
+                    logger.warning(f"Failed to clear {subdir} directory: {e}")
+        full_path = project_audio_dir / "full.wav"
+        if full_path.exists():
+            full_path.unlink(missing_ok=True)
+        previews_dir = project_audio_dir / "previews"
         previews_dir.mkdir(parents=True, exist_ok=True)
 
         mode_label = "极速并发" if turbo else "顺序"
@@ -349,6 +354,15 @@ def identify_chapters(project_id: int, db, project) -> None:
     crud.delete_audiobook_chapters(db, project_id)
     crud.delete_audiobook_segments(db, project_id)
 
+    project_audio_dir = Path(settings.OUTPUT_DIR) / "audiobook" / str(project_id)
+    for subdir in ("segments", "chapters"):
+        d = project_audio_dir / subdir
+        if d.exists():
+            shutil.rmtree(d, ignore_errors=True)
+    full_path = project_audio_dir / "full.wav"
+    if full_path.exists():
+        full_path.unlink(missing_ok=True)
+
     real_idx = 0
     for text in texts:
         if text.strip():
@@ -397,6 +411,18 @@ async def parse_one_chapter(project_id: int, chapter_id: int, user: User, db) ->
 
         crud.delete_audiobook_segments_for_chapter(db, project_id, chapter.chapter_index)
 
+        segments_dir = Path(settings.OUTPUT_DIR) / "audiobook" / str(project_id) / "segments"
+        if segments_dir.exists():
+            chapter_prefix = f"ch{chapter.chapter_index:03d}_"
+            for f in segments_dir.glob(f"{chapter_prefix}*.wav"):
+                f.unlink(missing_ok=True)
+        chapter_audio = Path(settings.OUTPUT_DIR) / "audiobook" / str(project_id) / "chapters" / f"chapter_{chapter.chapter_index}.wav"
+        if chapter_audio.exists():
+            chapter_audio.unlink(missing_ok=True)
+        full_path = Path(settings.OUTPUT_DIR) / "audiobook" / str(project_id) / "full.wav"
+        if full_path.exists():
+            full_path.unlink(missing_ok=True)
+
         chunks = _chunk_chapter(chapter.source_text, max_chars=1500)
         ps.append_line(key, f"共 {len(chunks)} 块\n")