Abstract: In this paper, the numerical weather prediction model is applied to regional rain attenuation forecast. The future rainfall rate and rain height of the top of the spatial distribution are obtained by WRF model. Then, parameters of the earth-space links such as frequency, polarization angle and elevation angle are applied to calculate the spatial distribution of rain attenuation. The results show that the forecast of rain attenuation agrees well with the rain attenuation based on the practical measurement, particularly in the variation trends over time.