Travel China - Currency Regulations

There is no limit on the amount of foreign currency and foreign exchange bills that can be brought into China by tourists, but it must be declared to the customs.

RMB should be converted back into foreign currency with the personal valid "foreign exchange certificate" before leaving China. Unused foreign exchange and RMB traveler's checks can be taken out of the country. Each tourist is permitted to take with them less than 6000 RMB.