Abstract: Precipitation data in Puyang city from 1954 to 2008 was analyzed in months,seasons and years based on linear trend test,T-detected method,and slide T-detected method.The results showed that annual precipitation decreased(-8.66mm per 10 years,|t|=1.5694t0.1/2=1.6684),rainstorm occurred early than the past.The days of heavy rain were in accordance with the amount of precipitation.

Key words: Varying characteristics of precipitation, Abrupt change, Bias of climate change