To discover how laser shock processing (LSP) affects the fatigue property of the blade made of K4030 alloy, the samples cut from blades and blades made of K4030 are laser shock processed , then the microstructure, micro-hardness, residual compressive stress and surface roughness of the samples are tested, and the fatigue life of the blades as well. The test results show that no obvious change of the surface roughness is found；a residual compressive stress more than 450MPa is developed in a depth of 1mm from the surface; some grains are observed refined in the grain boundary of shock region；the micro-hardness improves in a depth of 0.8mm from the surface， and the surface micro-hardness improves 16%. Fatigue test result shows the life of blade made of K4030 alloy is improved visibly after it is laser shock processed. So it is feasible to improve the fatigue life of K4030 blade using laser shock processing.