diff --git a/ge/graph/build/memory/graph_mem_assigner.cc b/ge/graph/build/memory/graph_mem_assigner.cc
index 8becd90e..b098a5f5 100755
--- a/ge/graph/build/memory/graph_mem_assigner.cc
+++ b/ge/graph/build/memory/graph_mem_assigner.cc
@@ -69,6 +69,10 @@ int64_t GetSymbolOutputOffset(const std::map<std::string, std::string> &anchor_t
   }
   return ge::kInvalidOffset;
 }
+
+bool isVariableMemoryNode(const ge::NodePtr &node) {
+  return (node->GetType() == ge::VARIABLE) || (node->GetType() == ge::CONSTANTOP);
+}
 }  // namespace
 namespace ge {
 Status VariableMemoryAssigner::Assign() {
@@ -447,22 +451,31 @@ bool IsContinuousInputConflict(const ge::NodePtr &node, const OpDescPtr &peer_op
 /// op1 -> node -> op2
 /// return true when node is ref from input, and op1 or op2 is reuse input from output
 bool GraphMemoryAssigner::IsRefFromInputOpCascade(const NodePtr &node) {
-  bool ref_from_input = false;
+  std::unordered_set<int32_t> ref_input_index;
   int32_t reuse_in_index = -1;
   for (const auto &out_anchor : node->GetAllOutDataAnchors()) {
-    ref_from_input = GraphUtils::IsRefFromInput(out_anchor, reuse_in_index);
-    if (ref_from_input) {
+    bool reuse_input = GraphUtils::IsRefFromInput(out_anchor, reuse_in_index);
+    if (reuse_input) {
       GELOGD("IsRefFromInputOpCascade: cur node:%s:%d is ref", node->GetName().c_str(), reuse_in_index);
-      break;
+      ref_input_index.insert(reuse_in_index);
     }
   }
+  bool ref_from_input = !ref_input_index.empty();
+  if (!ref_from_input) {
+    return false;
+  }
 
   for (const auto &in_anchor : node->GetAllInDataAnchors()) {
     const auto &peer_out_anchor = in_anchor->GetPeerOutAnchor();
     GE_IF_BOOL_EXEC(peer_out_anchor == nullptr, continue);
+    auto in_node = peer_out_anchor->GetOwnerNode();
+    if (isVariableMemoryNode(in_node) && (ref_input_index.count(in_anchor->GetIdx()) > 0)) {
+      GELOGD("Reuse variable memory, input node:%s, type:%s.", in_node->GetName().c_str(), in_node->GetType().c_str());
+      return false;
+    }
     if (ref_from_input && GraphUtils::IsRefFromInput(peer_out_anchor, reuse_in_index)) {
       GELOGD("IsRefFromInputOpCascade: in node[%s] is ref, reuse index is:%d",
-              peer_out_anchor->GetOwnerNode()->GetName().c_str(), reuse_in_index);
+             in_node->GetName().c_str(), reuse_in_index);
       return true;
     }
   }
@@ -500,6 +513,11 @@ Status GraphMemoryAssigner::UpdateRefOpOffsetReverse(const NodePtr &node) {
     GE_CHECK_NOTNULL(peer_out_anchor);
     auto peer_node = peer_out_anchor->GetOwnerNode();
     GE_CHECK_NOTNULL(peer_node);
+    if (isVariableMemoryNode(peer_node)) {
+      GELOGW("Peer node to update is %s, skip it. Node name:%s.",
+             peer_node->GetType().c_str(), peer_node->GetName().c_str());
+      continue;
+    }
     auto peer_op_desc = peer_node->GetOpDesc();
     GE_CHECK_NOTNULL(peer_op_desc);
     vector<int64_t> peer_output_list = peer_op_desc->GetOutputOffset();
diff --git a/ge/single_op/single_op_model.cc b/ge/single_op/single_op_model.cc
index 6959c6b3..5b5f24a2 100755
--- a/ge/single_op/single_op_model.cc
+++ b/ge/single_op/single_op_model.cc
@@ -613,7 +613,7 @@ Status SingleOpModel::BuildDynamicOp(StreamResource &resource, DynamicSingleOp &
   single_op.num_inputs_ = data_ops_.size();
   single_op.num_outputs_ = netoutput_op_->GetAllInputsSize();
   GE_CHK_STATUS_RET_NOLOG(InitModelMem(resource));
-  model_params_.memory_size = UINT_MAX;
+  model_params_.memory_size = UINT64_MAX;
   model_params_.graph_is_dynamic = true;
 
   auto ge_model = model_helper_.GetGeModel();
diff --git a/tests/ut/ge/graph/build/mem_assigner_unittest.cc b/tests/ut/ge/graph/build/mem_assigner_unittest.cc
index c9b0b579..785af2ef 100644
--- a/tests/ut/ge/graph/build/mem_assigner_unittest.cc
+++ b/tests/ut/ge/graph/build/mem_assigner_unittest.cc
@@ -525,6 +525,34 @@ TEST_F(UtestMemoryAssignerTest, graph_memory_assign_update_ref_op_offset_reverse
     EXPECT_EQ(memoryAssigner.UpdateRefOpOffsetReverse(add), SUCCESS);
 }
 
+TEST_F(UtestMemoryAssignerTest, graph_memory_assign_var_input_ref_cascade_false) {
+  ge::ut::GraphBuilder builder("graph");
+  auto var = builder.AddNode("var", VARIABLE, 1, 1);
+  auto broadcast = builder.AddNode("broadcast", HCOMBROADCAST, 1, 1);
+  auto assign = builder.AddNode("assign", "Assign", 2, 1);
+  // add link
+  builder.AddDataEdge(var, 0, assign, 0);
+  builder.AddDataEdge(var, 0, broadcast, 0);
+  builder.AddDataEdge(broadcast, 0, assign, 1);
+
+  int reuse_input_index = 0;
+  auto broadcast_desc = broadcast->GetOpDesc()->MutableOutputDesc(0);
+  ge::TensorUtils::SetReuseInput(*broadcast_desc, true);
+  ge::TensorUtils::SetReuseInputIndex(*broadcast_desc, reuse_input_index);
+
+  ge::ComputeGraphPtr graph = builder.GetGraph();
+
+  GraphMemoryAssigner memory_assigner(graph);
+  bool ref_cascade = memory_assigner.IsRefFromInputOpCascade(broadcast);
+  EXPECT_EQ(ref_cascade, false);
+  ref_cascade = memory_assigner.IsRefFromInputOpCascade(assign);
+  EXPECT_EQ(ref_cascade, false);
+  auto ret = memory_assigner.UpdateRefOpOffsetReverse(broadcast);
+  EXPECT_EQ(ret, SUCCESS);
+  ret = memory_assigner.UpdateRefOpOffsetReverse(assign);
+  EXPECT_EQ(ret, SUCCESS);
+}
+
 TEST_F(UtestMemoryAssignerTest, graph_memory_assign_atomic_output_and_workspace) {
   ge::ut::GraphBuilder builder("graph");
   auto data_input = builder.AddNode("data", "Data", 1, 1);