Precipitation interpolation algorithm plays an important role in meteorological business,which can generate area rainfall data from point rainfall data.Yet traditional interpolation method only considers the impact of distance on the estimated point data,thus cannot fully reflect the real drop-zone distribution of precipitation.The Doppler radar data are employed to improve rainfall interpolation results,which enables the interpolation results to better reflect the distribution characteristics of radar reflectivity,and to overcome the problem of sharp point in inverse distance weighting interpolation.Meteorological test results show that this method is reliable in precipitation interpolation and stable in calibration effect,thus can be applied in meteorological business.