They haven't.
Others have been ordered to stop sending money to BTCChina instead.
Nothing BTCChina can do about that.
here you go http://www.coindesk.com/bitcoin-price-falls-btc-china-exchange-shuts-fiat-deposits/
and yes third party payment processors like PayPal, Alipay, Yeepay, was suspended from the government, but banks transfers should work all the way, the Chinese move was a regulator move, but BTCChina suspended cash deposits, and again why the F%&$ ?!!!!
Well I don't know what's happening.
But what I do know if I was Chinese I certainly wouldn't be putting my fiat anywhere near an exchange at the present time.