This scope of the project included Shizitou sewage pumping station outlet to the Longxing tunnel entrance steel manifold and the Longxing tunnel section structural repair and geological improvement above the tunnel.As the operation in Longxing tunnel was carried out in water, and the daily construction periods were affected by the water level, the working environment was grim.Through the Longxing tunnel internal repair and supporting shallow ground improvement work, the problem of road surface leakage caused by pressurized drainage in the Longxing tunnel.