Abstract: In order to solve problems that hydrogen content cannot be detected on-line and kinetic model is difficult to be established in NdFeB hydrogen decrepitation process at present, the paper proposed a scheme which uses data driven method to implement forecasting of hydrogen content, and introduced modeling process of forecasting model of hydrogen content based on LS-SVM in details. The forecasting result showed that the model can forecast hydrogen content with small errors which would meet requirement of NdFeB hydrogen decrepitation process.