diff --git a/ppcls/arch/__init__.py b/ppcls/arch/__init__.py
index 1ec112de5107a7d20dc2db54c15a1c680099a89a..77b66c421ab3ce1712c83e92fdbfb55abb0d2302 100644
--- a/ppcls/arch/__init__.py
+++ b/ppcls/arch/__init__.py
@@ -14,12 +14,14 @@
 
 import sys
 import copy
+import importlib
 
 import paddle.nn as nn
 from paddle.jit import to_static
 from paddle.static import InputSpec
 
 from . import backbone
+from .backbone import *
 from .gears import build_gear
 from .utils import *
 from .backbone.base.theseus_layer import TheseusLayer
@@ -36,11 +38,8 @@ def build_model(config, mode="train"):
     model_type = arch_config.pop("name")
     use_sync_bn = arch_config.pop("use_sync_bn", False)
 
-    if hasattr(backbone, model_type):
-        model = ClassModel(model_type, **arch_config)
-    else:
-        model = getattr(sys.modules[__name__], model_type)("ClassModel",
-                                                           **arch_config)
+    mod = importlib.import_module(__name__)
+    model = getattr(mod, model_type)(**arch_config)
 
     if use_sync_bn:
         if config["Global"]["device"] == "gpu":
@@ -73,23 +72,6 @@ def apply_to_static(config, model):
     return model
 
 
-# TODO(gaotingquan): export model
-class ClassModel(TheseusLayer):
-    def __init__(self, model_type, **config):
-        super().__init__()
-        if model_type == "ClassModel":
-            backbone_config = config["Backbone"]
-            backbone_name = backbone_config.pop("name")
-        else:
-            backbone_name = model_type
-            backbone_config = config
-        self.backbone = getattr(backbone, backbone_name)(**backbone_config)
-
-    def forward(self, batch):
-        x, label = batch[0], batch[1]
-        return self.backbone(x)
-
-
 class RecModel(TheseusLayer):
     def __init__(self, **config):
         super().__init__()
diff --git a/ppcls/arch/backbone/base/__init__.py b/ppcls/arch/backbone/base/__init__.py
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..7a1fec9b8b2b69786aabb7ac8000fc2adadff1ee 100644
--- a/ppcls/arch/backbone/base/__init__.py
+++ b/ppcls/arch/backbone/base/__init__.py
@@ -0,0 +1,6 @@
+def clas_forward_decorator(forward_func):
+    def parse_batch_wrapper(model, batch):
+        x, label = batch[0], batch[1]
+        return forward_func(model, x)
+
+    return parse_batch_wrapper