diff --git a/agent/deep_assistant.py b/agent/deep_assistant.py
index 99158b5..643bdd5 100644
--- a/agent/deep_assistant.py
+++ b/agent/deep_assistant.py
@@ -22,6 +22,7 @@ from utils.fastapi_utils import detect_provider
 from .guideline_middleware import GuidelineMiddleware
 from .tool_output_length_middleware import ToolOutputLengthMiddleware
 from .tool_use_cleanup_middleware import ToolUseCleanupMiddleware
+from .filepath_fix_middleware import FilePathFixMiddleware
 from utils.settings import (
     SUMMARIZATION_MAX_TOKENS,
     SUMMARIZATION_TOKENS_TO_KEEP,
@@ -535,6 +536,7 @@ def create_custom_cli_agent(
 
     deepagent_middleware = [
         TodoListMiddleware(),
+        FilePathFixMiddleware(),  # 修复工具调用参数中 CJK 文件名的多余空格
         CustomFilesystemMiddleware(backend=composite_backend),  # 使用自定义的 FilesystemMiddleware，支持 SKILL.md 完整读取
         AnthropicPromptCachingMiddleware(unsupported_model_behavior="ignore"),
         PatchToolCallsMiddleware(),
diff --git a/agent/filepath_fix_middleware.py b/agent/filepath_fix_middleware.py
new file mode 100644
index 0000000..d3b7c71
--- /dev/null
+++ b/agent/filepath_fix_middleware.py
@@ -0,0 +1,88 @@
+import re
+import logging
+
+from langchain.agents.middleware import AgentMiddleware
+from langchain.tools.tool_node import ToolCallRequest
+
+logger = logging.getLogger('app')
+
+# 常见文件后缀（小写，用于正则匹配）
+_FILE_EXT = (
+    # 文档
+    r'txt|pdf|doc|docx|xls|xlsx|ppt|pptx|csv|md|rtf|odt|ods|odp'
+    r'|jtd|jtt|jaw'  # JustSystems Ichitaro
+    # 图片
+    r'|jpg|jpeg|png|gif|bmp|svg|webp|ico|tiff|tif'
+    # 音频
+    r'|mp3|wav|ogg|flac|aac|m4a'
+    # 视频
+    r'|mp4|avi|mov|mkv|wmv|flv|webm'
+    # 压缩
+    r'|zip|tar|gz|bz2|rar|7z|tgz'
+    # 代码/数据
+    r'|py|js|ts|html|htm|css|json|xml|yaml|yml|sql|sh|bat'
+    r'|java|c|cpp|h|rb|go|rs|php'
+    # 其他
+    r'|log|ini|cfg|conf|toml|env|bin|exe|dmg|iso|db|sqlite|tmp|bak'
+)
+
+_EXT_PATTERN = rf'\.(?:{_FILE_EXT})\b'
+
+# 锚点：文件后缀 或 目录分隔符 /（用于匹配路径中间的目录名）
+_ANCHOR = rf'(?:{_EXT_PATTERN}|/)'
+
+# 模式1: CJK字符 + 空格 + (以字母数字开头的片段 + 锚点)
+# "農作業 2025.jtd" → "農業2025.jtd"
+# "ファイル report.txt" → "ファイルreport.txt"
+# "/datasets/報告書 2025/file.txt" → "/datasets/報告書2025/file.txt"
+_CJK_TO_ALNUM = re.compile(
+    rf'([\u4e00-\u9fff\u3040-\u309f\u30a0-\u30ff])\s+([a-zA-Z0-9][\w]*{_ANCHOR})'
+)
+
+# 模式2: 数字 + 空格 + (以CJK开头的片段 + 锚点)
+# "2025 報告書.txt" → "2025報告書.txt"
+# "/datasets/2025 報告書/file.txt" → "/datasets/2025報告書/file.txt"
+# 注意: 只匹配数字不匹配字母，避免 "cat 報告.txt" 被误修
+# 注意: (?<!\.) 排除 "xxx.py ファイル.txt" 这种跨参数的误匹配
+_ALNUM_TO_CJK = re.compile(
+    rf'(?<!\.)(\d+)\s+([\u4e00-\u9fff\u3040-\u309f\u30a0-\u30ff][\w]*{_ANCHOR})'
+)
+
+# 模式3: 路径上下文中（/ 后面）的字母 + 空格 + (字母数字开头.后缀)
+# "/data/report 2025年度.xlsx" → "/data/report2025年度.xlsx"
+# 用 (?<=/) 确保只在路径中生效，避免 "cat report 2025.txt" 被误修
+_PATH_LETTER = re.compile(
+    rf'(?<=/)([a-zA-Z][\w]*)\s+([a-zA-Z0-9][\w]*{_ANCHOR})'
+)
+
+
+def fix_filename_spacing(text: str) -> str:
+    """修复文件名/路径中 CJK 与非CJK 交界处的多余空格（循环应用直到无更多匹配）"""
+    prev = None
+    while prev != text:
+        prev = text
+        text = _CJK_TO_ALNUM.sub(r'\1\2', text)
+        text = _ALNUM_TO_CJK.sub(r'\1\2', text)
+        text = _PATH_LETTER.sub(r'\1\2', text)
+    return text
+
+
+class FilePathFixMiddleware(AgentMiddleware):
+    """修复工具调用参数中 CJK 文件名/路径的多余空格"""
+
+    def _fix_tool_call_args(self, request: ToolCallRequest) -> None:
+        args = request.tool_call.get('args', {})
+        for key, value in args.items():
+            if isinstance(value, str):
+                fixed = fix_filename_spacing(value)
+                if fixed != value:
+                    logger.info(f"Filename spacing fix: args['{key}'] '{value}' -> '{fixed}'")
+                    args[key] = fixed
+
+    def wrap_tool_call(self, request, handler):
+        self._fix_tool_call_args(request)
+        return handler(request)
+
+    async def awrap_tool_call(self, request, handler):
+        self._fix_tool_call_args(request)
+        return await handler(request)