It has a serious effect to mechanical fault diagnosis in accuracy that the endpoint effect and modal aliasing phenomenon appear in EMD (empirical moded ecomposition). In order to restrain endpoint effect and modal aliasing phenomenon, improved EEMD (ensemble empirical mode decomposition) is put forward based on EEMD by using SVM (support vector machines) signal data extending. Compared with EMD and EEMD, the improved EEMD by using SVM signal data extending in simulation and measurement signals research results shows that not only the false modal component is reduced, and the endpoint effect is effectively restrained. And compared with the improved EEMD based on the mirror image signal extending, the improved EEMD by using SVM signal extending has more clearly time-frequency spectrum, less the false modal component, and effectively resolve decomposition distortion caused by the endpoint effect.