CLIGEN is a stochastic climate generator,based on the daily observed values of rainfall,the maximum and minimum temperature
and average wind velocity from 1986 to 2003 at comprehensive experimental station of soil and water conservation in Ansai and other climate factors gained by corresponding station all over the American,whose applicability in
Loess Plateau is tested.It is important to run and prove the applicability of water erosion forecast model WEPP in Loess Plaueau.The results showed that the single climate factor can be simulated preferably by CLIGEN if neglecting the relation within climate factors.Annual
precipitation and its monthly distribution and monthly distribution of daily maximum and minimum temperature can be simulated accurately,however,monthly average value and standard deviation of simulating value of wind velocity is generally higher that of observed values.The monthly average simulated value of probability between precipitation and non-precipitation is lower than that of observed value,it is the same to which between non-precipitation,and precipitation.Therefore,the climate factors should be analyzed synthetically in selecting experimental stations.