The main ways for the central bank to withdraw funds are through open market operation (issuing bills+repurchase) and raising the deposit reserve ratio.
In order to alleviate inflationary pressure, the amount of funds withdrawn is determined according to the adequacy of market funds: increase the amount of funds withdrawn when funds are plentiful, and reduce the amount of funds withdrawn when funds are not plentiful.
At present, the central bank is strengthening the withdrawal of funds, which means that China's monetary policy will remain tight in the second half of the year.