In the autoclave curing, the temperature distribution of the molding die has a significant effect on the curing quality of the composite. Increasing the temperature uniformity of the mold profile in direct contact with the component is beneficial to improve the internal temperature gradient, reduce the curing deformation, and improve the molding precision.Taking the composite component frame of the autoclave frame as the object, the finite element method is applied to analyze the distribution of the mold temperature, and the influence of the mold support structure on the surface temperature uniformity of the form is studied.Studies have shown that the thinner the thickness of the support plate, the better the temperature uniformity, and the influence of the support plate which is parallel to on the inlet air vent on the temperature uniformity is more significant. Therefore, it is preferred to increase the thickness of the support plate in the vertical direction of the inlet vent to increase die stiffness. Under the premise of keeping the area constant, the shape of the heat dissipation hole is changed, and it is found that the diamond shape and the circular heat dissipation hole have strong deformation resistance, and the square heat dissipation hole makes the surface temperature distribution of the template more uniform.When the airduct is changed by controlling the layout of the heat dissipation holes, it is found that the T-s-haped air passage is the best for improving the temperature uniformity.