diff --git a/paddle/fluid/operators/optimizers/lars_momentum_op.cu b/paddle/fluid/operators/optimizers/lars_momentum_op.cu
index caefd496978af2b6c34b61572fbb33725b33fab4..e90f1136fd30daa86b6a9afcd75c877a4de97a1a 100644
--- a/paddle/fluid/operators/optimizers/lars_momentum_op.cu
+++ b/paddle/fluid/operators/optimizers/lars_momentum_op.cu
@@ -28,7 +28,7 @@ limitations under the License. */
 #define LARS_BLOCK_SIZE 512
 #endif
 
-#define LARS_MAX_MERGED_OPS 150
+#define LARS_MAX_MERGED_OPS 60
 
 namespace paddle {
 namespace operators {
@@ -256,11 +256,8 @@ template <typename T, typename MT>
 struct LarsParamWarpper {
   int64_t numel_arr[LARS_MAX_MERGED_OPS];
   int repeat_arr[LARS_MAX_MERGED_OPS];
-  const T* __restrict__ p_arr[LARS_MAX_MERGED_OPS];
   const T* __restrict__ g_arr[LARS_MAX_MERGED_OPS];
-  const MT* __restrict__ v_arr[LARS_MAX_MERGED_OPS];
   const MT* __restrict__ lr_arr[LARS_MAX_MERGED_OPS];
-  const MT* __restrict__ master_p_arr[LARS_MAX_MERGED_OPS];
   T* __restrict__ p_out_arr[LARS_MAX_MERGED_OPS];
   MT* __restrict__ v_out_arr[LARS_MAX_MERGED_OPS];
   MT* __restrict__ master_p_out_arr[LARS_MAX_MERGED_OPS];
@@ -268,7 +265,7 @@ struct LarsParamWarpper {
 };
 
 template <typename T, typename MT>
-__global__ void MergedMomentumLarsKernel(LarsParamWarpper<T, MT>* lars_warpper,
+__global__ void MergedMomentumLarsKernel(LarsParamWarpper<T, MT> lars_warpper,
                                          MT* __restrict__ p_buffer,
                                          MT* __restrict__ g_buffer,
                                          const int op_num, const MT mu,
@@ -279,18 +276,18 @@ __global__ void MergedMomentumLarsKernel(LarsParamWarpper<T, MT>* lars_warpper,
   int tid = threadIdx.x + blockIdx.x * blockDim.x;
   const cooperative_groups::grid_group cg = cooperative_groups::this_grid();
   for (int i = 0; i < op_num; ++i) {
-    int numel = lars_warpper->numel_arr[i];
+    int numel = lars_warpper.numel_arr[i];
     MT param_norm = static_cast<MT>(0);
     MT grad_norm = static_cast<MT>(0);
-    L2NormKernel<T, MT>(&cg, lars_warpper->p_arr[i], lars_warpper->g_arr[i],
-                        p_buffer, g_buffer, numel, lars_warpper->repeat_arr[i],
+    L2NormKernel<T, MT>(&cg, lars_warpper.p_out_arr[i], lars_warpper.g_arr[i],
+                        p_buffer, g_buffer, numel, lars_warpper.repeat_arr[i],
                         rescale_grad, 0, &param_norm, &grad_norm);
     MomentumUpdate<T, MT>(
-        lars_warpper->p_arr[i], lars_warpper->g_arr[i],
-        lars_warpper->v_out_arr[i], lars_warpper->p_out_arr[i],
-        lars_warpper->v_out_arr[i], lars_warpper->master_p_arr[i],
-        lars_warpper->master_p_out_arr[i], lars_warpper->lr_arr[i], mu,
-        lars_warpper->weight_decay_arr[i], lars_coeff, epsilon, rescale_grad,
+        lars_warpper.p_out_arr[i], lars_warpper.g_arr[i],
+        lars_warpper.v_out_arr[i], lars_warpper.p_out_arr[i],
+        lars_warpper.v_out_arr[i], lars_warpper.master_p_out_arr[i],
+        lars_warpper.master_p_out_arr[i], lars_warpper.lr_arr[i], mu,
+        lars_warpper.weight_decay_arr[i], lars_coeff, epsilon, rescale_grad,
         param_norm, grad_norm, tid, grid_stride, numel, is_amp);
   }
 }
@@ -410,15 +407,21 @@ class LarsMomentumOpCUDAKernel : public framework::OpKernel<T> {
         size_t temp_numel = param[i]->numel();
         total_numel += temp_numel;
         lars_warpper.numel_arr[i] = temp_numel;
-        lars_warpper.p_arr[i] = param[i]->data<T>();
         lars_warpper.g_arr[i] = grad[i]->data<T>();
-        lars_warpper.v_arr[i] = velocity[i]->data<MT>();
         lars_warpper.lr_arr[i] = learning_rate[i]->data<MT>();
         lars_warpper.p_out_arr[i] =
             param_out[i]->mutable_data<T>(ctx.GetPlace());
         lars_warpper.v_out_arr[i] =
             velocity_out[i]->mutable_data<MT>(ctx.GetPlace());
         lars_warpper.weight_decay_arr[i] = static_cast<MT>(weight_decay_arr[i]);
+        PADDLE_ENFORCE_EQ(
+            param[i]->data<T>(), lars_warpper.p_out_arr[i],
+            platform::errors::InvalidArgument(
+                "Input(Param) and Output(ParamOut) must be the same Tensors."));
+        PADDLE_ENFORCE_EQ(velocity[i]->data<MT>(), lars_warpper.v_out_arr[i],
+                          platform::errors::InvalidArgument(
+                              "Input(Velocity) and Output(VelocityOut) must be "
+                              "the same Tensors."));
       }
       int64_t avg_numel = total_numel / op_num;
       LarsThreadConfig<float> lars_thread_config(avg_numel, sm_num,
@@ -429,19 +432,16 @@ class LarsMomentumOpCUDAKernel : public framework::OpKernel<T> {
       }
       if (multi_precision) {
         for (int i = 0; i < op_num; ++i) {
-          lars_warpper.master_p_arr[i] = master_param[i]->data<MT>();
           lars_warpper.master_p_out_arr[i] =
               master_param_out[i]->mutable_data<MT>(ctx.GetPlace());
+          PADDLE_ENFORCE_EQ(master_param[i]->data<MT>(),
+                            lars_warpper.master_p_out_arr[i],
+                            platform::errors::InvalidArgument(
+                                "Input(MasterParam) and Output(MasterParamOut) "
+                                "must be the same Tensors."));
         }
       }
-      auto merged_buf = memory::Alloc(cuda_ctx, sizeof(lars_warpper));
-      auto* merged_ptr =
-          reinterpret_cast<LarsParamWarpper<T, MT>*>(merged_buf->ptr());
-      memory::Copy(BOOST_GET_CONST(platform::CUDAPlace, cuda_ctx.GetPlace()),
-                   reinterpret_cast<void*>(merged_ptr), platform::CPUPlace(),
-                   reinterpret_cast<void*>(&lars_warpper), sizeof(lars_warpper),
-                   cuda_ctx.stream());
-      void* cuda_param[] = {reinterpret_cast<void*>(&merged_ptr),
+      void* cuda_param[] = {reinterpret_cast<void*>(&lars_warpper),
                             reinterpret_cast<void*>(&p_buffer),
                             reinterpret_cast<void*>(&g_buffer),
                             reinterpret_cast<void*>(&op_num),