Abstract: Based on the daily precipitation data from 1971 to 2013 in 7 weather stations in Dalian,the annual and seasonal variations of precipitation amount,precipitation days,precipitation intensity and contribution rate of precipitation under different grades were investigated in terms of a linear trend estimation method.Additionally,the reasons for significant changes in precipitation intensity were also examined.The results indicate that mean annual precipitation in Dalian during 1971-2013 shows a weak increasing trend.Precipitation in spring and summer during the last 43 years increases,whereas precipitation in autumn and winter decreases.Only spring precipitation during the last 43 years increases significantly.The annual and seasonal precipitation days during 1971-2013 show a downward trend and their trend do not pass the significant test.Annual and spring precipitation intensity increase significantly,whereas the variation trends of other seasonal precipitation intensity are not obvious.The significant increase of annual and spring precipitation intensity is due to the increasing contribution rate of annual and spring storm rainfall and storm rainfall days.