In order to study the accuracy of results with different interpolation method, this thesis used the 10 years' average rainfall **data** per month in three weather stations and eleven rainfall observation sites in the area, respectively with inverse weighting method, ordinary Kriging interpolation method, the most neighboring interpolation method and radial basis function interpolation method to do **data** interpolation to rainfall, and with verified and analysis to the different interpolation results, to obtain the interpolation precision and interpolation equivalence value maps of different interpolation methods, and consequently get the space variability of rainfall in the research area.