diff --git a/flearn/common/Trainer.py b/flearn/common/Trainer.py
index 0715789..1026145 100644
--- a/flearn/common/Trainer.py
+++ b/flearn/common/Trainer.py
@@ -82,7 +82,10 @@ def metrics(output, target):
     def forward(self, data, target):
         data, target = data.to(self.device), target.to(self.device)
         output = self.model(data)
-        return output
+
+        loss = self.criterion(output, target)
+        iter_acc = self.metrics(output, target)
+        return output, loss, iter_acc
 
     def batch(self, data, target):
         """训练/测试每个batch的数据
@@ -101,8 +104,7 @@ def batch(self, data, target):
             float : iter_acc
                     对应batch的accuracy
         """
-        output = self.forward(data, target)
-        loss = self.criterion(output, target)
+        _, loss, iter_acc = self.forward(data, target)
 
         if self.model.training:
             loss += self.fed_loss()
@@ -112,7 +114,6 @@ def batch(self, data, target):
 
             self.update_info()
 
-        iter_acc = self.metrics(output, target)
         return loss.data.item(), iter_acc
 
     @show_f