diff --git a/mgeconvert/mge_context/mge_transform.py b/mgeconvert/mge_context/mge_transform.py
index b849018..a5350c8 100644
--- a/mgeconvert/mge_context/mge_transform.py
+++ b/mgeconvert/mge_context/mge_transform.py
@@ -251,12 +251,12 @@ def _fuse_activation(net):
             activation = "RELU6" if isinstance(op, Relu6Opr) else activation
             prev_op.activation = activation
             prev_op.out_vars = op.out_vars
-            if len(op.out_oprs) > 0:
-                idx = op.out_oprs[0].inp_oprs.index(op)
-                op.out_oprs[0].inp_oprs[idx] = prev_op
-                prev_op.out_oprs = [op.out_oprs[0]]
-            else:
-                prev_op.out_oprs = []
+
+            for post_op in op.out_oprs:
+                idx = post_op.inp_oprs.index(op)
+                post_op.inp_oprs[idx] = prev_op
+                if post_op not in prev_op.out_oprs:
+                    prev_op.out_oprs.append(post_op)
 
             delete_intended.append(net._opr_ids.index(op_id))
 
@@ -873,4 +873,12 @@ def _replace_opr(net, matches: List[Ops.MgeOpr]):
         max_idx = max(net._opr_ids.index(i.id) for i in opr.inp_oprs)
         net._opr_ids.insert(max_idx + 1, opr.id)
         net.all_oprs.insert(max_idx + 1, opr)
-    net.all_oprs = list(filter(lambda opr: not opr.skip, net.all_oprs))
+    new_idxs = []
+    new_oprs = []
+    for idx, opr in zip(net._opr_ids, net.all_oprs):
+        if opr.skip:
+            continue
+        new_idxs.append(idx)
+        new_oprs.append(opr)
+    net._opr_ids = new_idxs
+    net.all_oprs = new_oprs