diff --git a/fastdeploy/engine/request.py b/fastdeploy/engine/request.py
index 391e2038534..b544ad2989c 100644
--- a/fastdeploy/engine/request.py
+++ b/fastdeploy/engine/request.py
@@ -19,7 +19,7 @@
 import json
 import time
 import traceback
-from dataclasses import asdict, dataclass, fields
+from dataclasses import asdict, dataclass, fields, is_dataclass
 from enum import Enum
 from typing import Any, Dict, Generic, Optional
 from typing import TypeVar as TypingTypeVar
@@ -896,7 +896,23 @@ def to_dict(self):
         """
         Convert the RequestMetrics object to a dictionary.
         """
-        return {k: v for k, v in asdict(self).items()}
+        res = {}
+        for k in self.__dataclass_fields__:
+            v = getattr(self, k)
+            if type(v) in (int, float, str, bool, type(None)):
+                res[k] = v
+            elif type(v) is list:
+                res[k] = list(v)
+            elif type(v) is dict:
+                res[k] = dict(v)
+            elif is_dataclass(v):
+                if hasattr(v, "to_dict"):
+                    res[k] = v.to_dict()
+                else:
+                    res[k] = asdict(v)
+            else:
+                res[k] = v
+        return res
 
     def record_recv_first_token(self):
         cur_time = time.time()
diff --git a/fastdeploy/worker/output.py b/fastdeploy/worker/output.py
index 365fec12475..2174fb24bf4 100644
--- a/fastdeploy/worker/output.py
+++ b/fastdeploy/worker/output.py
@@ -164,6 +164,20 @@ class SpeculateMetrics:
     """
     accept_ratio_per_head: list[float]
 
+    def to_dict(self):
+        res = {}
+        for k in self.__dataclass_fields__:
+            v = getattr(self, k)
+            if type(v) in (int, float, str, bool, type(None)):
+                res[k] = v
+            elif type(v) is list:
+                res[k] = list(v)
+            elif type(v) is dict:
+                res[k] = dict(v)
+            else:
+                res[k] = v
+        return res
+
 
 @dataclass
 class SamplerOutput: