Based on the typhoon(tropical cyclone) cases influencing Hainan during 1966-2013 and the daily precipitation data of 18 stations, statistical analysis shows that: 1) The effect of Hainan typhoon is peak before 1980s,but it is opposite after 1980s. 2) The annual average occurrence frequency and precipitation of Hainan typhoon rainstorm during 1966-2013,and the average and maximum proportions of typhoon precipitation to annual total precipitation decrease,but the typhoon process maximum precipitation and daily maximum precipitation weakly increase. 3) The middle-path landing typhoon can make more heavy rainstorm. 4) The first and second eigenvector fields of EOF modes are the consistent positive or opposite pattern in all areas and the north-south opposite pattern, respectively. The precipitation of Hainan typhoon rainstorm shows a decreasing trend with fluctuation during 1966-2013,with quasi 17,8 and 3-yr periodic variations.