The PBOC is issuing 20 billion yuan of three-month bills and 10 billion yuan of one-year bills.
The issuance came after China let the yuan weaken past the key 7 per dollar level amid the escalating trade war with the United States, and after Washington labeled the country a currency manipulator on Monday.
Traders say the PBOC has at times in the past used issuance in Hong Kong as a way to mop up liquidity and support offshore yuan levels.
The offshore yuan CNH=D3 was last seen at 7.0967 per dollar, after hitting record lows in early Asia trade.