Based on the data of the People′s Hospital of Weifang,Shandong Province,combined with the general meteorological observation,the relation between the incidence of four diseases,such as breath system diseases,coronary heart diseases and other cardiopathy,cerebral hemorrhage and other cerebrovascular diseases,high blood pressure and other cycle system disease,and meteorological conditions is analyzed.First,the monthly change of incidence of the four kinds of diseases and its correlation with meteological conditions is obtained.Then,a multiple regression equation is established to predict the frequently occurring periods and the less occurring periods of the four kinds of diseases.