Multiple transverse mode laser oscillator of high repetition-rate Nd:glass shock treatment installation is disscussed. The design of high repetition-rate Nd:glass laser shock processing and the parameters of various optical elements are given.The laser output energy,pulse width and amplified spontaneous emission (ASE) are measured at the single frequence and 0.5 Hz frequence. The results show that the laser output energy can reach more than 40 J,with laser width of 22 ns and ASE of about 16 mJ,and the laser can be used for laser shock processing.