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Temperature field in high average power disk-type laser is investigated with fluid-solid interaction (FSI). The coolant flow, heat diffusion, heat convection, and heat conduction in the pumping and cooling processes are analyzed without the arbitrary values of thermal boundary conditions, including boundary temperature, heat flux, or heat exchange coefficient at the cooling faces, which are in turn the simulation results. The velocity field and temperature field of coolant are explored as well as the temperature field of gain medium. Moreover, the influences of coolant flow velocity, deposited heat power and gain medium thickness on temperature field are discussed. Experimental results reveal that simulation of temperature in gain medium with the FSI can get a more accurate temperature filed.