diff --git a/src/spaceone/identity/model/user/request.py b/src/spaceone/identity/model/user/request.py
index 64073171..a87eb868 100644
--- a/src/spaceone/identity/model/user/request.py
+++ b/src/spaceone/identity/model/user/request.py
@@ -122,7 +122,7 @@ class UserWorkspacesRequest(BaseModel):
 
 
 class UserFindRequest(BaseModel):
-    keyword: str
+    keyword: Union[str, None] = None
     state: Union[State, None] = None
     exclude_workspace_id: Union[str, None] = None
     page: Union[dict, None] = None
diff --git a/src/spaceone/identity/service/user_service.py b/src/spaceone/identity/service/user_service.py
index f1c51f82..85627639 100644
--- a/src/spaceone/identity/service/user_service.py
+++ b/src/spaceone/identity/service/user_service.py
@@ -603,14 +603,17 @@ def find(self, params: UserFindRequest) -> Union[UsersSummaryResponse, dict]:
 
         query = {
             "filter": [{"k": "domain_id", "v": params.domain_id, "o": "eq"}],
-            "filter_or": [
-                {"k": "user_id", "v": params.keyword, "o": "contain"},
-                {"k": "name", "v": params.keyword, "o": "contain"},
-            ],
+            "sort": {"key": "user_id"},
             "page": params.page,
             "only": ["user_id", "name", "state"],
         }
 
+        if params.keyword:
+            query["filter_or"] = [
+                {"k": "user_id", "v": params.keyword, "o": "contain"},
+                {"k": "name", "v": params.keyword, "o": "contain"},
+            ]
+
         if params.state:
             query["filter"].append({"k": "state", "v": params.state, "o": "eq"})
 
@@ -634,7 +637,6 @@ def find(self, params: UserFindRequest) -> Union[UsersSummaryResponse, dict]:
             "name",
             "state",
             "email",
-            "user_type",
             "auth_type",
             "domain_id",
         ]