diff --git a/runtime/datamate-python/app/core/config.py b/runtime/datamate-python/app/core/config.py
index 10adb00..df3efa2 100644
--- a/runtime/datamate-python/app/core/config.py
+++ b/runtime/datamate-python/app/core/config.py
@@ -66,7 +66,7 @@ class Settings(BaseSettings):
     datamate_backend_base_url: str = "http://datamate-backend:8080/api"
 
     # 标注编辑器（Label Studio Editor）相关
-    editor_max_text_bytes: int = 2 * 1024 * 1024  # 2MB，避免一次加载超大文本卡死前端
+    editor_max_text_bytes: int = 0  # <=0 表示不限制，正数为最大字节数
 
 # 全局设置实例
 settings = Settings()
diff --git a/runtime/datamate-python/app/module/annotation/service/text_fetcher.py b/runtime/datamate-python/app/module/annotation/service/text_fetcher.py
index 8bea9ca..bd24c25 100644
--- a/runtime/datamate-python/app/module/annotation/service/text_fetcher.py
+++ b/runtime/datamate-python/app/module/annotation/service/text_fetcher.py
@@ -19,23 +19,24 @@ async def fetch_text_content_via_download_api(dataset_id: str, file_id: str) ->
             resp = await client.get(url)
             resp.raise_for_status()
 
+            max_bytes = settings.editor_max_text_bytes
             content_length = resp.headers.get("content-length")
-            if content_length:
+            if max_bytes > 0 and content_length:
                 try:
-                    if int(content_length) > settings.editor_max_text_bytes:
+                    if int(content_length) > max_bytes:
                         raise HTTPException(
                             status_code=413,
-                            detail=f"文本文件过大，限制 {settings.editor_max_text_bytes} 字节",
+                            detail=f"文本文件过大，限制 {max_bytes} 字节",
                         )
                 except ValueError:
                     # content-length 非法则忽略，走实际长度判断
                     pass
 
             data = resp.content
-            if len(data) > settings.editor_max_text_bytes:
+            if max_bytes > 0 and len(data) > max_bytes:
                 raise HTTPException(
                     status_code=413,
-                    detail=f"文本文件过大，限制 {settings.editor_max_text_bytes} 字节",
+                    detail=f"文本文件过大，限制 {max_bytes} 字节",
                 )
 
             # TEXT POC：默认按 UTF-8 解码，不可解码字符用替换符处理