Based on the data of beginning time and final severity ration of winter wheat powdery mildew,synchronous meteorological factors of representative stations in Jiangsu province in recent affect 10 years,the characteristic of influence of meteorological condition on winter wheat powdery mildew was studied in terms of sliding correlation analysis.It was found that meteorological conditions affect notably the beginning time and final situation of winter wheat powdery mildew,but the influence varies in different phase and region.Based on the conclusion given abov,the prediction model of winter wheat powdery mildew was developed.