In this paper, the historical precipitation data has been analyzed, the temporal spatial distribution of atmospheric precipitation of north and west of China have been studied in detail. Choosing 5 global climate change models recommended by IPCC, the atmospheric precipitation of China in 2030 has been analyzed under different scenario. Finally, the future trend of atmospheric precipitation in north and west of China is revealed and the preliminary judgment of the probability of mitigating the drought in north of China has been given.