diff --git a/nanobot/agent/tools/web.py b/nanobot/agent/tools/web.py
index 9de1d3c..90cdda8 100644
--- a/nanobot/agent/tools/web.py
+++ b/nanobot/agent/tools/web.py
@@ -116,7 +116,7 @@ class WebFetchTool(Tool):
         # Validate URL before fetching
         is_valid, error_msg = _validate_url(url)
         if not is_valid:
-            return json.dumps({"error": f"URL validation failed: {error_msg}", "url": url})
+            return json.dumps({"error": f"URL validation failed: {error_msg}", "url": url}, ensure_ascii=False)
 
         try:
             async with httpx.AsyncClient(
@@ -131,7 +131,7 @@ class WebFetchTool(Tool):
             
             # JSON
             if "application/json" in ctype:
-                text, extractor = json.dumps(r.json(), indent=2), "json"
+                text, extractor = json.dumps(r.json(), indent=2, ensure_ascii=False), "json"
             # HTML
             elif "text/html" in ctype or r.text[:256].lower().startswith(("<!doctype", "<html")):
                 doc = Document(r.text)
@@ -146,9 +146,9 @@ class WebFetchTool(Tool):
                 text = text[:max_chars]
             
             return json.dumps({"url": url, "finalUrl": str(r.url), "status": r.status_code,
-                              "extractor": extractor, "truncated": truncated, "length": len(text), "text": text})
+                              "extractor": extractor, "truncated": truncated, "length": len(text), "text": text}, ensure_ascii=False)
         except Exception as e:
-            return json.dumps({"error": str(e), "url": url})
+            return json.dumps({"error": str(e), "url": url}, ensure_ascii=False)
     
     def _to_markdown(self, html: str) -> str:
         """Convert HTML to markdown."""
diff --git a/nanobot/channels/dingtalk.py b/nanobot/channels/dingtalk.py
index 4a8cdd9..6b27af4 100644
--- a/nanobot/channels/dingtalk.py
+++ b/nanobot/channels/dingtalk.py
@@ -208,7 +208,7 @@ class DingTalkChannel(BaseChannel):
             "msgParam": json.dumps({
                 "text": msg.content,
                 "title": "Nanobot Reply",
-            }),
+            }, ensure_ascii=False),
         }
 
         if not self._http:
diff --git a/nanobot/cli/commands.py b/nanobot/cli/commands.py
index 2f4ba7b..d879d58 100644
--- a/nanobot/cli/commands.py
+++ b/nanobot/cli/commands.py
@@ -243,7 +243,7 @@ Information about the user goes here.
     for filename, content in templates.items():
         file_path = workspace / filename
         if not file_path.exists():
-            file_path.write_text(content)
+            file_path.write_text(content, encoding="utf-8")
             console.print(f"  [dim]Created {filename}[/dim]")
     
     # Create memory directory and MEMORY.md
@@ -266,12 +266,12 @@ This file stores important information that should persist across sessions.
 ## Important Notes
 
 (Things to remember)
-""")
+""", encoding="utf-8")
         console.print("  [dim]Created memory/MEMORY.md[/dim]")
     
     history_file = memory_dir / "HISTORY.md"
     if not history_file.exists():
-        history_file.write_text("")
+        history_file.write_text("", encoding="utf-8")
         console.print("  [dim]Created memory/HISTORY.md[/dim]")
 
     # Create skills directory for custom user skills
diff --git a/nanobot/config/loader.py b/nanobot/config/loader.py
index 134e95f..c789efd 100644
--- a/nanobot/config/loader.py
+++ b/nanobot/config/loader.py
@@ -55,8 +55,8 @@ def save_config(config: Config, config_path: Path | None = None) -> None:
 
     data = config.model_dump(by_alias=True)
 
-    with open(path, "w") as f:
-        json.dump(data, f, indent=2)
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(data, f, indent=2, ensure_ascii=False)
 
 
 def _migrate_config(data: dict) -> dict:
diff --git a/nanobot/heartbeat/service.py b/nanobot/heartbeat/service.py
index 221ed27..a51e5a0 100644
--- a/nanobot/heartbeat/service.py
+++ b/nanobot/heartbeat/service.py
@@ -65,7 +65,7 @@ class HeartbeatService:
         """Read HEARTBEAT.md content."""
         if self.heartbeat_file.exists():
             try:
-                return self.heartbeat_file.read_text()
+                return self.heartbeat_file.read_text(encoding="utf-8")
             except Exception:
                 return None
         return None