The thermal lens effect of high-power all solid state thin disk lasers in operation can cause the laser output power to decrease and the beam quality to deteriorate. In this paper, focus on this problem, porous SiC foam and millimeter channels are introduced into the heat transfer heat sink of the thin disk laser and applied to all solid state thin disk laser. The finite element analysis software is used to optimize the structural model. And the simulation analysis indicates that, when the thickness of SiC is 2 mm, the porosity is 40% and the inlet pressure is 4 kg (0.4 MPa), the theoretical heat transfer coefficient is 1.51×10⁵ W/m²·K, the experimental heat transfer coefficient is 1.45×10⁵ W/m²·K, the results are similar to each other, which verifies the correctness of the theoretical model. Finally, the new heat sink is used to build a 24 multi-passes all solid state thin disk lasers experimental device based on Yb:YAG. The continuous laser output with output power of 393 W and wavelength of 1 030 nm is obtained, the optical-optical efficiency is 52% and the beam product parameter is 5.918 mm·mrad.