diff --git a/internlm/initialize/launch.py b/internlm/initialize/launch.py
index 660cc55..985e57f 100644
--- a/internlm/initialize/launch.py
+++ b/internlm/initialize/launch.py
@@ -319,6 +319,13 @@ def args_sanity_check():
     if "moe_loss_coeff" not in gpc.config.loss:
         gpc.config.loss._add_item("moe_loss_coeff", 1.0)
 
+    # moe not support overlap and zero1.5 for now
+    if hasattr(gpc.config.model, "num_experts"):
+        assert (
+            not optim_ckpt.overlap_sync_grad & optim_ckpt.overlap_sync_param
+        ), "not support overlap and moe at the same time"
+        assert gpc.config.parallel.zero1 == -1, "moe only support zero1, set zero1=-1 can fix this"
+
 
 def launch(
     config: Union[str, Path, Config, Dict],
diff --git a/internlm/solver/optimizer/hybrid_zero_optim.py b/internlm/solver/optimizer/hybrid_zero_optim.py
index 3ca18e4..3b06e9c 100644
--- a/internlm/solver/optimizer/hybrid_zero_optim.py
+++ b/internlm/solver/optimizer/hybrid_zero_optim.py
@@ -288,7 +288,6 @@ class HybridZeroOptimizer(BaseOptimizer):
             for j in range(len(param.size())):
                 global_id = "_".join([global_id, str(param.size()[j])])
             if self._overlap_sync_param:
-                assert not hasattr(gpc.config.model, "num_experts")
                 rank_to_go = self._param_bcast_sync_handler.get_rank_by_param(param)
             else:
                 rank_to_go = numel_per_rank.index(min(numel_per_rank))
diff --git a/internlm/utils/model_checkpoint.py b/internlm/utils/model_checkpoint.py
index 566bb0f..00e7436 100644
--- a/internlm/utils/model_checkpoint.py
+++ b/internlm/utils/model_checkpoint.py
@@ -392,13 +392,14 @@ def save_optimizer_checkpoint(optim, state_path):
     zero_rank = gpc.get_local_rank(ParallelMode.ZERO1)
     tp_rank = gpc.get_local_rank(ParallelMode.TENSOR)
     pp_rank = gpc.get_local_rank(ParallelMode.PIPELINE)
+    zero_size = gpc.get_world_size(ParallelMode.ZERO1)
     tp_size = gpc.get_world_size(ParallelMode.TENSOR)
     pp_size = gpc.get_world_size(ParallelMode.PIPELINE)
     fp = f"optimizer_tp{tp_rank}_pp{pp_rank}_zo{zero_rank}.pt"
 
     states = optim.state_dict()
     if isinstance(optim, HybridZeroOptimizer):
-        if gpc.get_global_rank() < optim.zero_world_size * tp_size * pp_size:
+        if gpc.get_global_rank() < zero_size * tp_size * pp_size:
             llm_save(os.path.join(state_path, fp), states)
             if "zero_devide_optim_plan" in states:
                 params_per_rank_id_dict = states.pop("zero_devide_optim_plan")
diff --git a/tests/test_utils/test_model_checkpoint.py b/tests/test_utils/test_model_checkpoint.py
index b12ccad..0804455 100644
--- a/tests/test_utils/test_model_checkpoint.py
+++ b/tests/test_utils/test_model_checkpoint.py
@@ -109,7 +109,7 @@ def compare_optim_state(optim1, optim2):
         fp32_buff2 = optim2._fp32_flat_param_groups_of_current_rank
         for group_id_1, group_id_2 in zip(fp32_buff1, fp32_buff2):
             re &= group_id_1 == group_id_2
-            if optim1.zero_local_rank not in optim1.param_group_no_params_ranks[group_id_1]:
+            if optim1.zero_local_rank[group_id_1] not in optim1.param_group_no_params_ranks[group_id_1]:
                 re &= torch.equal(fp32_buff1[group_id_1], fp32_buff1[group_id_2])
     else:
         for group1, group2 in zip(optim1.param_groups, optim2.param_groups):