diff --git a/tests/test_shardformer/test_model/_utils.py b/tests/test_shardformer/test_model/_utils.py
index c9da9d32e..c51df07f6 100644
--- a/tests/test_shardformer/test_model/_utils.py
+++ b/tests/test_shardformer/test_model/_utils.py
@@ -210,7 +210,7 @@ def check_weight(org_model: Module,
 
         if is_distributed_tensor(sharded_weight) or is_customized_distributed_tensor(sharded_weight):
             sharded_weight_list = [
-                torch.zeros([*sharded_weight.shape]).to('cuda') for _ in range(dist.get_world_size(tp_group))
+                torch.zeros_like(sharded_weight).to('cuda') for _ in range(dist.get_world_size(tp_group))
             ]
             dist.all_gather(sharded_weight_list, sharded_weight, tp_group)
             sharded_weight = torch.cat(sharded_weight_list, dim=dim)
@@ -219,7 +219,7 @@ def check_weight(org_model: Module,
             print(f"'{suffix}' weight: {org_weight}, {sharded_weight}")
 
         assert torch.allclose(org_weight.float(), sharded_weight.float(), atol=atol, rtol=rtol), \
-            f"shard model weight is not equal to origin model weight\n{org_weight}\n{sharded_weight}"
+            f"shard model weight {suffix} is not equal to origin model weight\n{org_weight}\n{sharded_weight}"
 
 
 def check_grad(org_model: Module,
@@ -236,9 +236,7 @@ def check_grad(org_model: Module,
         shard_weight = getattr_(sharded_model, suffix).weight
 
         if is_distributed_tensor(shard_weight) or is_customized_distributed_tensor(shard_weight):
-            shard_grad_list = [
-                torch.zeros([*shard_grad.shape]).to('cuda') for _ in range(dist.get_world_size(tp_group))
-            ]
+            shard_grad_list = [torch.zeros_like(shard_grad).to('cuda') for _ in range(dist.get_world_size(tp_group))]
             dist.all_gather(shard_grad_list, shard_grad, tp_group)
             shard_grad = torch.cat(shard_grad_list, dim=dim)
 
diff --git a/tests/test_shardformer/test_model/test_shard_gpt2.py b/tests/test_shardformer/test_model/test_shard_gpt2.py
index 3ac8fa26d..274cfaa39 100644
--- a/tests/test_shardformer/test_model/test_shard_gpt2.py
+++ b/tests/test_shardformer/test_model/test_shard_gpt2.py
@@ -23,7 +23,6 @@ def check_forward_backward(model_fn, data_gen_fn, output_transform_fn, loss_fn,
     org_model, org_optimizer, sharded_model, sharded_optimizer, criterion, booster = \
         build_model_from_hybrid_plugin(model_fn, loss_fn, test_config)
 
-
     org_loss, org_output, sharded_loss, sharded_output = \
         run_forward_backward_with_hybrid_plugin(
             org_model,
@@ -47,7 +46,6 @@ def check_forward_backward(model_fn, data_gen_fn, output_transform_fn, loss_fn,
         if org_model.__class__.__name__ == 'GPT2Model':
             check_output_hidden_state(org_output, sharded_output, stage_manager, atol=atol, rtol=rtol)
 
-        # check loss
         check_loss(org_loss, sharded_loss, atol=atol, rtol=rtol)
 
     def unwrap(module):
@@ -92,13 +90,14 @@ def check_forward_backward(model_fn, data_gen_fn, output_transform_fn, loss_fn,
     'num_microbatches': 4,
     'enable_all_optimization': True,
     'use_lazy_init': True,
-    'precision': 'fp32',
+    'precision': 'fp16',
+    'initial_scale': 1,
 }, {
     'tp_size': 1,
     'pp_size': 2,
     'num_microbatches': 4,
     'enable_all_optimization': True,
-    'use_lazy_init': False,
+    'use_lazy_init': True,
     'precision': 'fp16',
     'initial_scale': 1,
 }, {
@@ -112,7 +111,6 @@ def check_forward_backward(model_fn, data_gen_fn, output_transform_fn, loss_fn,
 def run_gpt2_test(test_config):
 
     # TODO: add test_config for TP+DP after supporting & debugging it
-    # TODO: check and debug TP+AMP
 
     sub_model_zoo = model_zoo.get_sub_registry('transformers_gpt')