diff --git a/chunk_codegen.py b/chunk_codegen.py
index a8b970116..e3a7643d7 100644
--- a/chunk_codegen.py
+++ b/chunk_codegen.py
@@ -1198,7 +1198,7 @@ class FlowTracer(object):
             chunk_node_list.remove(n)
         non_chunk_inputs = _find_chunk_all_input_nodes(chunk_node_list)
         for i in non_chunk_inputs:
-            if i not in chunk_info["inputs"] and i not in prepose_nodes:
+            if i not in chunk_info["inputs"]:
                 chunk_info["inputs_non_chunk"].append(i)
 
         return chunk_info
@@ -1425,6 +1425,7 @@ class MemoryEstimator(object):
                 ) / (1024**2)
 
             # determine chunk ratio for current node
+            # TODO: adapt to prepose node memory
             if chunk_within:
                 chunk_ratio = self._get_chunk_ratio(
                     node,
@@ -1602,7 +1603,6 @@ class ChunkRegionSearch(object):
         chunk_infos = []
         for end_dim, end_trace_idx in enumerate(end_trace["idx"]):
             if len(start_traces) > 1:
-                # TODO: implement multi input chunk
                 continue
             for start_node, start_trace in start_traces.items():
                 for start_dim, start_trace_idx in enumerate(start_trace["idx"]):
@@ -1831,7 +1831,6 @@ def _find_chunk_compute_input_and_output_nodes(nodes: List[Node]):
 
     # if a node has a user node which is not in the node list
     # we treat that user node as the node receiving the current node output
-    # TODO: it is unsafe to remove non compute node here
     for node in nodes:
         for output_node in node.users.keys():
             if (
@@ -1900,6 +1899,8 @@ def emit_code_with_chunk(
 
     chunk_outputs = [i["outputs"][0] for i in chunk_search]
     chunk_outputs_dim = [i["outputs_dim"] for i in chunk_search]
+    
+    chunk_prepose_nodes = [i["args"]["prepose_nodes"] for i in chunk_search]
 
     node_idx = 0
     region_idx = 0
@@ -1911,7 +1912,11 @@ def emit_code_with_chunk(
         if node_idx in chunk_starts:
             within_chunk_region = True
             region_idx = chunk_starts.index(node_idx)
-
+            # add prepose nodes
+            for i in chunk_prepose_nodes[region_idx]:
+                prepose_node = node_list[_find_idx_by_name(i.name, node_list)]
+                emit_node_func(prepose_node, body)
+                delete_unused_value_func(prepose_node, body, chunk_inputs_names)
             # add for loop
             body.append(
                 _gen_loop_start(
@@ -1922,20 +1927,22 @@ def emit_code_with_chunk(
             )
 
         if within_chunk_region:
-            emit_node_func(node, body)
-            # replace input var with chunk var
-            for input_node_idx, input_node in enumerate(chunk_inputs[region_idx]):
-                for idx, dim in chunk_inputs_dim[region_idx][input_node_idx].items():
-                    if idx == node_idx:
-                        chunk_slice = _gen_chunk_slice_dim(
-                            dim, "chunk_idx", _get_node_shape(input_node)
-                        )
-                        body[-1] = _replace_name(
-                            body[-1], input_node.name, input_node.name + chunk_slice
-                        )
-            body[-1] = "    " + body[-1]
-            delete_unused_value_func(node, body, chunk_inputs_names)
-
+            if any(node.name == i.name for i in chunk_prepose_nodes[region_idx]):
+                pass
+            else:
+                emit_node_func(node, body)
+                # replace input var with chunk var
+                for input_node_idx, input_node in enumerate(chunk_inputs[region_idx]):
+                    for idx, dim in chunk_inputs_dim[region_idx][input_node_idx].items():
+                        if idx == node_idx:
+                            chunk_slice = _gen_chunk_slice_dim(
+                                dim, "chunk_idx", _get_node_shape(input_node)
+                            )
+                            body[-1] = _replace_name(
+                                body[-1], input_node.name, input_node.name + chunk_slice
+                            )
+                body[-1] = "    " + body[-1]
+                delete_unused_value_func(node, body, chunk_inputs_names)
         else:
             emit_node_func(node, body)
             if node_idx not in chunk_inputs: