The earthquake magnitude and energy sequence are fitted by using mathematical model based on mean generation function and prediction for medium term earthquake trend of next three years are made.The method has following features:couple score criterion is applied for raising the fitting accuracy and rate;and balance between numerical prediction and trend prediction is considers;the multistage fitting of difference sequence for raising accuracy and speed of fitting is used.Besides,the optimum period of the time sequence is given.The earthquake trend of Chinese continent in next 1~3 years is forecasted by using the method.