OK, first thanx for everyone's help. but This problem is actually solved... and for a very low price.
Just went to some local hardware store, changed the plug, then.... it works!!
So turns out the original charger will work with 220V, just have to plug in direct to the wall socket. Because of the plug is different between US and China, before i always use some surge protector or plug convertor to try it, that way it won't charge at all.
Again, thanx for all the help!!