To deal with the reflective cracks and wet foundation surface in asphalt pavement construction of immersed tube tunnel, the shrinkage and differential settlement of structural joints and construction joints in different types of immersed tube tunnels are analyzed, and the factors affecting tunnel humidity are studied. The test results show that: (1) The reflective cracks of tunnel pavement can be effectively prevented by adopting seamless expansion joints for immersed pipe joints, App waterproof coil + filling joints for deformation joints, and polyester glass fiber cloth + filling joints for construction joints; (2) Through the rational use of natural temperature changes and the use of mechanical ventilation, the tunnel humidity can be effectively reduced to ensure dry base surface, and the working environment can be improved; (3) By blasting the base surface and selecting a reasonable asphalt structure layer, the waterproofing and durability of asphalt pavement surface of immersed tube tunnel can be effectively improved.