Based on the winter temperature data of Zhejiang Province since 1954, the warm winter years of Zhejiang Province are defined. It is found that in the warm winter the zonal circulation in the westerly belt of Asia is always popular and the intensity of west Pacific subtropical high is stronger than the mean and its position is westward of the mean. So, the warm winter years have a good relation with the total precipitation of Zhejiang Province during the flood season and the number of typhoon effecting Zhejiang Province during the typhoon season.