The volume on offer compares with the CNY50 billion sold last week, an auction in which the yield unexpectedly remained flat at 1.3684% after rising the previous week for the first time since August 13.
The PBOC sold CNY24 billion in one-year paper on Tuesday with the yield up another eight basis points to 1.9264% after rising by a similar amount during last week's auction.
Some traders believe that the central bank is keeping a lid on three-month paper while guiding the rate on one-year paper higher in order to widen the spread and make the longer-dated paper more attractive.
The central bank drained a net CNY102 billion from the banking system last week.
