Waterproof and vapor barrier film is a high-performance flexible composite material that uses a sandwich structure to endow the product with multiple excellent comprehensive properties such as high strength, flexibility, waterproofing, and vapor barrier. This product provides soft protective sealing for the indoor side of door and window openings, waterproof and blocking moisture transmission, achieving complete indoor airtightness. Waterproof and vapor barrier membranes are laid on top of the foundation layer, which can enhance the water tightness of the building while preventing indoor moisture from penetrating into the insulation layer, protecting the insulation layer from erosion. (The adhesive type membrane needs to be equipped with a dedicated MS primer) This ensures excellent water vapor insulation effect on the wall or roof, and allows the water vapor inside the enclosure to be smoothly discharged through the waterproof and breathable membrane, protecting the thermal performance of the enclosure structure and achieving energy conservation.