Vibration fatigue tests were performed on aluminizing, LSP after aluminizing、aluminizing after LSP K417 alloy specimen respectively. The results showed that, compared with that treated by aluminizing only, the fatigue strength of specimen treated by aluminizing after LSP was improved by 50%and that treated by LSP after aluminizing was improved by 30%. It showed that the composite technology of LSP and aluminizing can improve the fatigue performance, and the composite technology of aluminizing after LSP can improve more effectively. The influence of different technology order to mechanical properties were investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The improvement mechanism of the fatigue performance was discussed. The results indicate that the LSP can promote the process of aluminizing. The combination of aluminizing layer with matrix is more close and a large number of columnar crystals formed in the surface treated by aluminizing after LSP, which lead to the thickness of aluminizing layer increase, and then the fatigue performance improved. But the LSP after aluminizing only affects the surface strengthening, and the improvement of fatigue performance is limited.