diff --git a/test/core/test_loss.py b/test/core/test_loss.py
index d7cafc13..d45d54e3 100644
--- a/test/core/test_loss.py
+++ b/test/core/test_loss.py
@@ -1,14 +1,5 @@
-import os
 import unittest
 
-from fastNLP.core.dataset import DataSet
-from fastNLP.core.metrics import SeqLabelEvaluator
-from fastNLP.core.field import TextField, LabelField
-from fastNLP.core.instance import Instance
-from fastNLP.core.optimizer import Optimizer
-from fastNLP.core.trainer import SeqLabelTrainer
-from fastNLP.models.sequence_modeling import SeqLabeling
-
 import fastNLP.core.loss as loss
 import math
 import torch as tc