diff --git a/fleetrec/core/trainer.py b/fleetrec/core/trainer.py
index b3a6cc2ee101ca8b38c84ff6c707ccbfc7120d10..06b5800ee49fdf51be51d9ca1e9e304c46d174cd 100755
--- a/fleetrec/core/trainer.py
+++ b/fleetrec/core/trainer.py
@@ -89,7 +89,7 @@ def user_define_engine(engine_yaml):
         _config = yaml.load(rb.read(), Loader=yaml.FullLoader)
     assert _config is not None
 
-    envs.set_runtime_envions(_config)
+    envs.set_runtime_environs(_config)
 
     train_location = envs.get_global_env("engine.file")
     train_dirname = os.path.dirname(train_location)
diff --git a/fleetrec/core/utils/envs.py b/fleetrec/core/utils/envs.py
index e4a04440f403fa9c7a9357fd7424bdb6a058e9f1..a4bc20f2e367e59071981525c3ccf81b0d4070be 100644
--- a/fleetrec/core/utils/envs.py
+++ b/fleetrec/core/utils/envs.py
@@ -18,13 +18,14 @@ import copy
 global_envs = {}
 
 
-def set_runtime_envions(envs):
+def flatten_environs(envs):
+    flatten_dict = {}
     assert isinstance(envs, dict)
 
     def fatten_env_namespace(namespace_nests, local_envs):
         if not isinstance(local_envs, dict):
             global_k = ".".join(namespace_nests)
-            os.environ[global_k] = str(local_envs)
+            flatten_dict[global_k] = str(local_envs)
         else:
             for k, v in local_envs.items():
                 if isinstance(v, dict):
@@ -33,18 +34,24 @@ def set_runtime_envions(envs):
                     fatten_env_namespace(nests, v)
                 else:
                     global_k = ".".join(namespace_nests + [k])
-                    os.environ[global_k] = str(v)
+                    flatten_dict[global_k] = str(v)
 
     for k, v in envs.items():
         fatten_env_namespace([k], v)
 
+    return flatten_dict
 
-def get_runtime_envion(key):
+
+def set_runtime_environs(environs):
+    for k, v in environs.items():
+        os.environ[k] = v
+
+def get_runtime_environ(key):
     return os.getenv(key, None)
 
 
 def get_trainer():
-    train_mode = get_runtime_envion("trainer.trainer")
+    train_mode = get_runtime_environ("trainer.trainer")
     return train_mode
 
 
diff --git a/fleetrec/examples/ctr-dnn_train.yaml b/fleetrec/examples/ctr-dnn_train.yaml
index 3e91d52a62e9ed46a2b199ffebd6cfd03448d3aa..35cd1aeb4e8e0a63016316b53a6adb378172194d 100644
--- a/fleetrec/examples/ctr-dnn_train.yaml
+++ b/fleetrec/examples/ctr-dnn_train.yaml
@@ -13,6 +13,17 @@
 # limitations under the License.
 
 train:
+  trainer:
+    trainer: "/root/FleetRec/fleetrec/examples/user_define_trainer.py"
+    threads: 4
+    # for cluster training
+    strategy: "async"
+    communicator:
+      send_queue_size: 4
+      min_send_grad_num_before_recv: 4
+      thread_pool_size: 5
+      max_merge_var_num: 4
+
   epochs: 10
 
   reader:
diff --git a/fleetrec/examples/runtime.yaml b/fleetrec/examples/runtime.yaml
deleted file mode 100644
index 70fa27c3f2cea6db19d10ffdddc2edfd7fe72983..0000000000000000000000000000000000000000
--- a/fleetrec/examples/runtime.yaml
+++ /dev/null
@@ -1,13 +0,0 @@
-trainer:
-  trainer: "/root/FleetRec/fleetrec/examples/user_define_trainer.py"
-  threads: 4
-
-  # for cluster training
-  strategy: "async"
-  communicator:
-    send_queue_size: 4
-    min_send_grad_num_before_recv: 4
-    thread_pool_size: 5
-    max_merge_var_num: 4
-
-
diff --git a/fleetrec/run.py b/fleetrec/run.py
index e0afe5a1b041bc05fad0143bfaec6299fc853713..9fbb1bbaaa3cf6846b084a4f1f4ef71d63a361fe 100644
--- a/fleetrec/run.py
+++ b/fleetrec/run.py
@@ -13,16 +13,23 @@ clusters = ["SINGLE", "LOCAL_CLUSTER", "CLUSTER"]
 
 
 def set_runtime_envs(cluster_envs, engine_yaml):
-    if engine_yaml is not None:
+    def get_engine_extras():
         with open(engine_yaml, 'r') as rb:
             _envs = yaml.load(rb.read(), Loader=yaml.FullLoader)
-    else:
-        _envs = {}
+
+        flattens = envs.flatten_environs(_envs)
+
+        engine_extras = {}
+        for k, v in flattens.items():
+            if k.startswith("train.trainer."):
+                engine_extras[k] = v
+        return engine_extras
 
     if cluster_envs is None:
         cluster_envs = {}
-    envs.set_runtime_envions(cluster_envs)
-    envs.set_runtime_envions(_envs)
+
+    envs.set_runtime_environs(cluster_envs)
+    envs.set_runtime_environs(get_engine_extras())
 
     need_print = {}
     for k, v in os.environ.items():
@@ -62,9 +69,8 @@ def cluster_engine(args):
     cluster_envs = {}
     cluster_envs["trainer.trainer"] = "ClusterTrainer"
     cluster_envs["trainer.engine"] = "cluster"
-    set_runtime_envs(cluster_envs, args.engine_extras)
+    set_runtime_envs(cluster_envs, args.model)
 
-    envs.set_runtime_envions(cluster_envs)
     trainer = TrainerFactory.create(args.model)
     return trainer
 
@@ -146,11 +152,6 @@ if __name__ == "__main__":
     if args.engine.upper() not in clusters:
         raise ValueError("argument engine: {} error, must in {}".format(args.engine, clusters))
 
-    if args.engine_extras is not None:
-        if not os.path.exists(args.engine_extras) or not os.path.isfile(args.engine_extras):
-            raise ValueError(
-                "argument engine_extras: {} error, must specify an existed YAML file".format(args.engine_extras))
-
     which_engine = get_engine(args.engine)
     engine = which_engine(args)
     engine.run()