diff --git a/fleetrec/core/utils/envs.py b/fleetrec/core/utils/envs.py
index 2aa6951e468887a3b23a462cdb5f0de41925f96b..e4a04440f403fa9c7a9357fd7424bdb6a058e9f1 100644
--- a/fleetrec/core/utils/envs.py
+++ b/fleetrec/core/utils/envs.py
@@ -22,14 +22,18 @@ def set_runtime_envions(envs):
     assert isinstance(envs, dict)
 
     def fatten_env_namespace(namespace_nests, local_envs):
-        for k, v in local_envs.items():
-            if isinstance(v, dict):
-                nests = copy.deepcopy(namespace_nests)
-                nests.append(k)
-                fatten_env_namespace(nests, v)
-            else:
-                global_k = ".".join(namespace_nests + [k])
-                os.environ[global_k] = str(v)
+        if not isinstance(local_envs, dict):
+            global_k = ".".join(namespace_nests)
+            os.environ[global_k] = str(local_envs)
+        else:
+            for k, v in local_envs.items():
+                if isinstance(v, dict):
+                    nests = copy.deepcopy(namespace_nests)
+                    nests.append(k)
+                    fatten_env_namespace(nests, v)
+                else:
+                    global_k = ".".join(namespace_nests + [k])
+                    os.environ[global_k] = str(v)
 
     for k, v in envs.items():
         fatten_env_namespace([k], v)
diff --git a/fleetrec/run.py b/fleetrec/run.py
index 51c8a583e7875cbe19db0431f572c186614b8350..e0afe5a1b041bc05fad0143bfaec6299fc853713 100644
--- a/fleetrec/run.py
+++ b/fleetrec/run.py
@@ -26,7 +26,7 @@ def set_runtime_envs(cluster_envs, engine_yaml):
 
     need_print = {}
     for k, v in os.environ.items():
-        if k.startswith() == "trainer.":
+        if k.startswith("trainer."):
             need_print[k] = v
 
     print(envs.pretty_print_envs(need_print, ("Runtime Envs", "Value")))