diff --git a/veadk/tracing/base_tracer.py b/veadk/tracing/base_tracer.py
index deeffddd..1b632285 100644
--- a/veadk/tracing/base_tracer.py
+++ b/veadk/tracing/base_tracer.py
@@ -27,6 +27,25 @@
 logger = get_logger(__name__)
 
 
+def replace_bytes_with_empty(data):
+    """
+    Recursively traverse the data structure and replace all bytes types with empty strings.
+    Supports handling any nested structure of lists and dictionaries.
+    """
+    if isinstance(data, dict):
+        # Handle dictionary: Recursively process each value
+        return {k: replace_bytes_with_empty(v) for k, v in data.items()}
+    elif isinstance(data, list):
+        # Handle list: Recursively process each element
+        return [replace_bytes_with_empty(item) for item in data]
+    elif isinstance(data, bytes):
+        # When encountering the bytes type, replace it with an empty string
+        return "<image data>"
+    else:
+        # Keep other types unchanged
+        return data
+
+
 class BaseTracer(ABC):
     def __init__(self, name: str):
         self.app_name = "veadk_app_name"
@@ -117,8 +136,11 @@ def tracer_hook_after_model(
             role = getattr(user_content, "role", None)
 
         if user_content and getattr(user_content, "parts", None):
+            # content = user_content.model_dump_json(exclude_none=True)
             content = user_content.model_dump(exclude_none=True).get("parts", None)
-            content = json.dumps(content) if content else None
+            if content:
+                content = replace_bytes_with_empty(content)
+            content = json.dumps(content, ensure_ascii=False) if content else None
 
         if role and content:
             attributes["gen_ai.prompt.0.role"] = role
diff --git a/veadk/tracing/telemetry/opentelemetry_tracer.py b/veadk/tracing/telemetry/opentelemetry_tracer.py
index 0f100ba6..d2fb0291 100644
--- a/veadk/tracing/telemetry/opentelemetry_tracer.py
+++ b/veadk/tracing/telemetry/opentelemetry_tracer.py
@@ -179,7 +179,9 @@ def dump(
         self._trace_id = trace_id
         file_path = f"{path}/{self.name}_{user_id}_{session_id}_{trace_id}.json"
         with open(file_path, "w") as f:
-            json.dump(data, f, indent=4)
+            json.dump(
+                data, f, indent=4, ensure_ascii=False
+            )  # ensure_ascii=False to support Chinese characters
 
         self._trace_file_path = file_path