The forecast elements were chosen from the data of field catches and rainfall of Gongzhuling and the forecast targets were determined on the outbreak and damage areas of Jilin province,which belong to the yearly second generation adults and their next generation larvae of oriental aormyworm Mythimna separata (Walker)in east China.The regression correlation method was applied to study the forecast mathematics formula,and the computing,analysis and fitting were carried out by computer program of Basic language.The forecast models of the second generation oriental armyworm of Jilin province were put forwarded.