On the basis of the triangle shear deformation theory,the governing equation of sandwich plates was derived,and the critical thermal buckling temperature of sandwich plates was solved by Rayleigh Ritz method.By considering the temperature changing along the thickness direction,the influence of temperature function index,boundary conditions,side-to-thickness ratio,aspect ratio,face-to-thickness ratio and fiber angle on the critical thermal buckling temperature of sandwich plates was studied.The results show that the critical thermal buckling temperature of sandwich plate with uniform temperature is the minimum.The critical thermal buckling temperature of nonlinear temperature sandwich plate is the maximum.The critical thermal buckling temperature decreases with the increase of the side-to-thickness ratio and face-to-thickness ratio.The critical thermal buckling temperature of a rectangular sandwich plate is greater than that of a square sandwich plate under simply supported boundary conditions.For the square sandwich plate under the four boundary conditions studied in this paper,the critical thermal buckling temperature of simple supports is the smallest,and the critical thermal buckling temperature of solid supports is the largest.The maximum critical thermal buckling temperature of square sandwich plates occurs when the fiber angles is 45° and 135°.