There are several levels in my game.When I use level_load() to change into another level,How to stop the former one,how to release the memory it take?

Can you please be a little more specific, i don't exactly know what you mean (doesn't this belong in the script-forum?)
If you post more detailed, we can help you better.

well,I mean there is a level running,and in its script I use load_level() to load another level.When the second level loaded,the first one is still running(though we can't see it) and it eat a large amount of memory.How can I stop the first level and release the memory it take

@upczhsh

Please do not cross-post. Only one thread/post is allowed per topic/question, and this is the second one I have seen (I replied to your post in Scripting Forum).