In order to find a good method to repair the corrosion damage of LY12CZ, laser cladding Al-Y (4%Y) and Al-Si (12%Si) powder on LY12CZ was studied by changing the technological parameters of the YAG pulsed laser, such as current, pulse width, frequency, spot diameter and scanning velocity. Through studing the fatigue test, analyzing the fatigue fracture and metallic phase, the result shows that the fatigue life of the laser cladding Al-Y is 339% of the cladding Al-Si alloy specimens. There was little pore and impurity in the Al-Y layer which joins with the substrate firmly. There is fatigue ribbon and fatigue setback in the expansion region of the crack. There are many holes in the Al-Si layer which does not appear the low-cycle fatigue characteristic.