In order to improve mechanical properties and corrosion resistance of brass surface, laser shock processing (LSP) of brass surface was achieved by nanosecond pulse laser (wavelength of 1064nm and pulse width of 7ns). The mechanical properties such as surface residual stress, cross section metallographic structure, hardness and surface morphology of LSP brass were analyzed. The effects of these properties on corrosion resistance were studied. The results show that, compared with brass samples without LSP treatment, the electrochemical corrosion potential of brass samples increases after LSP treatment. The quality of cavitation loss is reduced by only 1/4 of the original. The incubation period of cavitation erosion was prolonged by two times. The rate of cavitation erosion decreases. LSP treatment improves the corrosion resistance of brass samples. This study is helpful for the application of ordinary brass in corrosive working environment.