diff --git a/examples/werewolf_game/evals/eval.py b/examples/werewolf_game/evals/eval.py
index 3093d80f2..c890773de 100644
--- a/examples/werewolf_game/evals/eval.py
+++ b/examples/werewolf_game/evals/eval.py
@@ -17,6 +17,7 @@ from tqdm import tqdm
 from utils import Utils
 
 from metagpt.const import DEFAULT_WORKSPACE_ROOT, METAGPT_ROOT
+from metagpt.environment.werewolf.const import RoleType
 
 
 class Vote:
@@ -92,20 +93,20 @@ class Vote:
         # find all werewolves
         werewolves = []
         for match in pattern.finditer(text):
-            if match.group(2) == "Werewolf":
+            if match.group(2) == RoleType.WEREWOLF.value:
                 werewolves.append(match.group(1))
 
         # find all non_werewolves
         non_werewolves = []
         for match in pattern.finditer(text):
-            if match.group(2) != "Werewolf":
+            if match.group(2) != RoleType.WEREWOLF.value:
                 non_werewolves.append(match.group(1))
         num_non_werewolves = len(non_werewolves)
 
         # count players other than werewolves made the correct votes
         correct_votes = 0
         for match in pattern.finditer(text):
-            if match.group(2) != "Werewolf" and match.group(3) in werewolves:
+            if match.group(2) != RoleType.WEREWOLF.value and match.group(3) in werewolves:
                 correct_votes += 1
 
         # cal the rateability of non_werewolves
diff --git a/metagpt/environment/werewolf/werewolf_ext_env.py b/metagpt/environment/werewolf/werewolf_ext_env.py
index 588fc0b9b..a8636536b 100644
--- a/metagpt/environment/werewolf/werewolf_ext_env.py
+++ b/metagpt/environment/werewolf/werewolf_ext_env.py
@@ -166,9 +166,9 @@ class WerewolfExtEnv(ExtEnv):
         """init players using different roles' num"""
         role_objs = []
         for role_obj in role_uniq_objs:
-            if "Villager" in str(role_obj):
+            if RoleType.VILLAGER.value in str(role_obj):
                 role_objs.extend([role_obj] * num_villager)
-            elif "Werewolf" in str(role_obj):
+            elif RoleType.WEREWOLF.value in str(role_obj):
                 role_objs.extend([role_obj] * num_werewolf)
             else:
                 role_objs.append(role_obj)
diff --git a/tests/metagpt/environment/werewolf_env/test_werewolf_ext_env.py b/tests/metagpt/environment/werewolf_env/test_werewolf_ext_env.py
index d515c3159..986d55e1a 100644
--- a/tests/metagpt/environment/werewolf_env/test_werewolf_ext_env.py
+++ b/tests/metagpt/environment/werewolf_env/test_werewolf_ext_env.py
@@ -2,34 +2,34 @@
 # -*- coding: utf-8 -*-
 # @Desc   : the unittest of WerewolfExtEnv
 
-from metagpt.environment.werewolf.const import RoleState
+from metagpt.environment.werewolf.const import RoleState, RoleType
 from metagpt.environment.werewolf.werewolf_ext_env import WerewolfExtEnv
 from metagpt.roles.role import Role
 
 
 class Werewolf(Role):
-    profile: str = "Werewolf"
+    profile: str = RoleType.WEREWOLF.value
 
 
 class Villager(Role):
-    profile: str = "Villager"
+    profile: str = RoleType.VILLAGER.value
 
 
 class Witch(Role):
-    profile: str = "Witch"
+    profile: str = RoleType.WITCH.value
 
 
 class Guard(Role):
-    profile: str = "Guard"
+    profile: str = RoleType.GUARD.value
 
 
 def test_werewolf_ext_env():
     players_state = {
-        "Player0": ("Werewolf", RoleState.ALIVE),
-        "Player1": ("Werewolf", RoleState.ALIVE),
-        "Player2": ("Villager", RoleState.ALIVE),
-        "Player3": ("Witch", RoleState.ALIVE),
-        "Player4": ("Guard", RoleState.ALIVE),
+        "Player0": (RoleType.WEREWOLF.value, RoleState.ALIVE),
+        "Player1": (RoleType.WEREWOLF.value, RoleState.ALIVE),
+        "Player2": (RoleType.VILLAGER.value, RoleState.ALIVE),
+        "Player3": (RoleType.WITCH.value, RoleState.ALIVE),
+        "Player4": (RoleType.GUARD.value, RoleState.ALIVE),
     }
     ext_env = WerewolfExtEnv(players_state=players_state, step_idx=4, special_role_players=["Player3", "Player4"])