English：

The rationality of the selection of external wall thermal insulation materials directly affects thethermal insulation performance of building structures and building energy consumption. It is of greatsignificance to study the performance of external wall thermal insulation materials for building greencarbon reduction. Based on this, the composition, thermodynamic performance, advantages anddisadvantages of common external wall thermal insulation materials are compared and analyzed, and theheat conduction performance of six common external wall thermal insulation materials is numericallysimulated. The analysis shows that when the thickness of thermal insulation materials is the same, thethermal insulation performance of thermal insulation materials from good to poor is polyurethane rigid foamboard, foamed polystyrene foam board, glass wool, rock wool board, foam glass board and vitrifiedmicrosphere thermal insulation mortar. The outer surface temperature of the insulation layer is linearlyinversely related to the thickness of the insulation layer, and the thickness of the insulation layer willincrease the insulation effect of the structure. With the increase of the thermal conductivity of theinsulation layer, the temperature of the outer surface of the insulation layer increases. When selecting theinsulation layer, the insulation material with small thermal conductivity should be selected as far aspossible.