diff --git a/qwen3-tts-backend/core/audiobook_service.py b/qwen3-tts-backend/core/audiobook_service.py
index 25640e4..746b404 100644
--- a/qwen3-tts-backend/core/audiobook_service.py
+++ b/qwen3-tts-backend/core/audiobook_service.py
@@ -361,7 +361,7 @@ 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)
 
-        chunks = _chunk_chapter(chapter.source_text, max_chars=4000)
+        chunks = _chunk_chapter(chapter.source_text, max_chars=1500)
         ps.append_line(key, f"共 {len(chunks)} 块\n")
 
         seg_counter = 0
diff --git a/qwen3-tts-backend/core/llm_service.py b/qwen3-tts-backend/core/llm_service.py
index 78287a1..968271e 100644
--- a/qwen3-tts-backend/core/llm_service.py
+++ b/qwen3-tts-backend/core/llm_service.py
@@ -29,6 +29,7 @@ class LLMService:
             "temperature": 0.3,
             "max_tokens": max_tokens,
             "stream": True,
+            "enable_thinking": False,
         }
         full_text = ""
         timeout = httpx.Timeout(connect=10.0, read=90.0, write=10.0, pool=5.0)
@@ -87,6 +88,8 @@ class LLMService:
                 {"role": "user", "content": user_message},
             ],
             "temperature": 0.3,
+            "max_tokens": 8192,
+            "enable_thinking": False,
         }
 
         timeout = httpx.Timeout(connect=10.0, read=90.0, write=10.0, pool=5.0)