In view of the maze composite cooling structure tile of combustor, a three-dimensional numerical simulation program is adopted to gain the distribution law of temperature field, displacement field and stress field. The research shows that the numerical simulation method adopted has better veracity and can reflect the tile's thermal-stress coupled field factually. The calculation result shows that the design of this cooling structure is reasonable, the structural strength can accord with the demands under the condition of simulation experiment environment and meet the experiment's demands.