Abstract: According to the 17 stations daily precipitation data of Henan province from 1965 to 2014， using the slip averaging method， Mann-Kendall tendency test method， drought and flood analysis method and climate tendency method，it analyzes the precipitation spatial and temporal change rules.The results show that in recent 50 years，annual rainfall distribution of Henan province of is uneven.The rainfall mainly concentrates in summer and autumn season； The precipitation in spring， summer， autumn and winter showed an increase of 0.87 mm ／10a， 6.98 mm ／10a， 4.09 mm ／10a， 2.63mm ／10a.The number of precipitation days in most areas is decreasing，and the daily average precipitation of precipitation is increasing.The annual precipitation and the precipitation in different seasons are both from south to north or from southeast to northwest are decreasing.