Abstract: The author thinks that there is a very good relativity between occurring of landsides and rainfall in Bailuyuan area, according to the data of weather in Bailuyuan area and using Kerman sieve wave analysis method.It is conclusions that there are 5 years short cycle, 10 years middle cycle and 20 years long cycle in landslides of Bailuyuan area. Hence, the judgment that there is a concentrated occurring of landslides in 2003 is made. Meanwhile, the difference and regulation of rainfall in different neighbour area are discovered,and prediction of rainfall in Bailuyuan area can be made according to the rainfall information from Ninqiang county. Therefore,the preventive methods of land slides can be made ahead of time.