hi all, is there a way for admin to manually resume a process which is stuc

This can happen if the sub-process has more than one End Event and the one that you triggered doesn't have a black circule in the center (Terminate Event)

yes, we don't have terminate event. but we only have one end event.
btw, is it true if an exception happens in one node of sub-process two( like i described above), even cancel the sub-process two and restart a new one won't make sub-process one completed?

Sub-process two has nothing to do with Sub-process one, therefore the fact that you cancel the node and launched a new instance doesn't mean the first process will be marked as completed. Instead you need to make sure you also cancel the process, not only the node, if the sub-process one(from the Processes tab) still shows as Problem with Task

is there any way for admin to manually resume the process

I don't think you need to restart the broken sub-process if you don't want that process (you already launched a new instance), simply go to the parent, right click on the sub-process node -> 2 Instances and verify one is Completed and the other is Cancelled, is that the case?

Not sure if this helps, but if you have a subprocess with a node paused by exception, it's possible to complete (and skip) that process by cancelling the node with the exception and starting one of the end events. The process will complete and the parent will continue as normal.

The trick is, you have to make sure that either the newly restarted flow reaches a terminate end event (the one with the black circle in it) or you first cancel the 'broken' node so the broken flow is completed and then restart the node. If you start the node first, the existing 'broken' flow will still exist when the fixed one reaches an end event. When the end event is reached the results are sent back to the calling process, but it doesn't continue where it left off.