Abstract: In order to did some research to ensure the suitable sowing period of winter wheat in Yaodu District, Linfen under the background of climatic warming, which aims to protect winter wheat from freeze injury and help them form seeding. According to the meteorological observation data and the winter wheat observation data before winter from 1981 to 2010 in Yaodu District, Linfen, the author compared the effects of climatic warming on sowing period by using correlation analysis and other statistical methods. The results showed that on the basis of selection of suitable varieties, the suitable sowing period was from September 27th to October 8th in Yaodu District, Linfen; that was, the second half to dew. Before September 27th, it’s easy to cause the exuberant growth before winter. After October 8th, it’s easy to form weak seedling before winter and it’s not conducive to winter.