Weathering resistance of polyurethane board, foam concrete board and vacuum insulation panel under the functions of freeze thaw, humid heat, dry wet, high low temperature and multi field coupling cycle, combined with load and moisture migration and other factors on roofing insulation composite materials and parts. The heat transfer rule and construction process were simulated. It is shown that the mass loss rate of the foam concrete board and the polyurethane board in the weathering resistance is larger, and the thermal conductivity is gradually increased with time. However, the thermal conductivity and the mass loss rate of the vacuum insulation panel are not significant without being punctured by external pressure. The results of the simulation calculations show that the bottom temperature increases by 5% when structural deformation is considered.