Abstract: The grey system forecasting model，neural network forecasting model and SVM（Support Vector Machine） forecasting model are proposed in this paper.Taking library budge of a library from year of 1996 to 2003 as a study case，the forecasting results are gotten by three methods.From the forecasting results，it is concluded that the accuracy of the SVM forecasting method is higher.Analyzing the characteristic of combining forecasting method，based on grey system forecasting model，neural network forecasting model and SVM，the linear combining forecasting model and SVM combining forecasting model are set up.Compared with single prediction methods and linear combining forecasting method，the accuracy of the SVM combining forecasting method is higher.