 This paper proposes an improved numerical simulation method for soft rock tunnels under high geostress conditions. It takes into account the effects of confining pressure on the mechanical properties of surrounding rock and introduces a transverse loop discriminate update procedure into the iteration calculation process of FLAC3D. This allows for the automatic updating of the mechanical parameters of surrounding rock with their variable stress states. An improved expression of the longitudinal deformation profile, LDP, for tunnels considering the confining pressure influence is also proposed based on numerous simulation results for a soft rock tunnel. This article was authored by Yu Tsang Dong, Hai Zhang, Zheng Guazhou, and others.