The exterior wall insulation project of housing building is a green environmental protection project,and the performance and selection of materials not only determine its thermal performance,but also affect the appearance and integrity of the building itself,and are also very closely related to building fire prevention.In the process of selecting the selection of external wall insulation materials,the basic performance should be analyzed in detail,combined with the actual building and key indicators such as thermal conduction,fire prevention,and water absorption,so as to create higher economic and environmental benefits on the basis of meeting the basic safety and warmth needs.