Abstract:Several interpolating methods were discussed on the basis of the preciptation data of Wenzhou .The best interpolating method of estimating area rainfall in the eastern coastal hill regions was concluded . According to the weather system the rain of Wenzhou are classified into cold air,inverse trough,southwest low vortex, Mei-Yu,typhoon,convection on edge of subtropical anticyclone.By analyzing the synoptic chart and preciptation records of 90 rain gauging staions,the characteristic rain procedures were chosed out,and the characteristic day preciptation of each procedure was chosed out too,which is the data of experiment.The chosed day preciptation was interpolated by the most popular methods, such as inverse distance,krige,and spline under different density level of rain gauging station.According to the evaluating criteria which were made previously,each interpolation method was analyzed.Therefore,the best interpolation method that suited to use in eastern coastal hill regions was chosed objectively, and its requirements of station density were figured out too.