If you don't intend to take the currency out of China, looks like
its not subject to declaring.

I doubt China has much if any restrictions about bringing money into the country.:


Outward has no provision regarding exclusion of declaration, only inward.

Inward passengers
Passengers carrying foreign currencies in cash worth more than US$5,000 and intending to take the currencies out of China in the future shall fill out two declaration forms.

http://english.customs.gov.cn/Static...dbb565e4f.html