The daily reference rate was set at 6.3969 yuan to $1.0, slightly stronger than Friday's 6.3975, the China Foreign Exchange Trade System said.
Chinese authorities keep a tight grip on the currency and it is only allowed to fluctuate up or down two percent on either side of the reference rate.
Authorities had based the rate on a poll of market-makers, but last week shocked financial markets by suddenly cutting the value of the yuan nearly two percent and moving to what they say is a more market-oriented system.
The mechanism now also takes into account the previous day's close, foreign exchange supply and demand and the rates of major currencies.