The research on an all-solid-state high power laser capable of generating CW power at 1 064 nm that is greater than 500 W is reported. To facilitate thermal management,undoped YAG end caps are diffusion bonded to the central Nd.YAG,and the thermal focal problem is weakened. In the experiment,the transmission rate of the output mirror of 10% ,30%,35%,40% are chosen respectively , and the maximum 512 W output power at 1 064 nm with 32 % optical-optical conversion efficiency is achieved.