Based on the long sequences daily precipitation data observed at 12 stations (Beichuan, Lixian, Maoxian, Mianzhu, Pingwu, Qingchuan, Shifang, Wenchuan, Jiangyou, Anxian, Pengzhou) in the earthquake areas of Wenchuan during the period 1966-2012, these was had systematic diagnostic analysis on the precipitation type, geographical distribution, interannual variability, quasi-periodic and mutation characteristics, distribution characteristics of different intensity precipitation days and precipitation, distribution characteristics of precipitation-concentration degree (PCD) and precipitation-concentration period (PCP), characteristics of precipitation concentrated in wet and dry years, and the impact on landslides, debeis flows and other geological disaster in earthquake areas. These studies have important theoretical and practical application significance for prevention project of geological disaster triggered by heavy rains in the earthquake areas.