Answered by Shun from Poland | Oct. 15, 2013 23:01
As I know, if you take more than 20,000 RMB out China, you need to get certain proof from a bank. But for taking much money into China, no documents are needed. Just declare them and fill in the declaration form. If get the permission of the customs, it is ok to come in.
I remember you can take out 2,500RMB evert time from ATM and it is allowed to take ten times with one card.