Based on the Guanggu 1st Road- Gaoxin 4th Road Drainage Channel Project in the red clay area of Wuhan City, the finite element analysis software PLAXIS was used, numerical analysis of the tunnel with double-side drift method was carried out, focusing on the surface settlement at different stages. On this basis, a fitting regression analysis was performed for different settlement curves. The results show that as the tunnel propulsion, the maximum surface settlement gradually increases, and the volume loss caused by tunneling also gradually increases. The surface settlement curve is in the form of Peck settlement curve distribution at different stages. It is proper to fit the surface settlement curve induced by tunneling using least square regression analysis.