Abstract: Aiming at the problems of geological hazards such as water gushing caused by tunnel excavation in water-rich area, on the basis of hydro-geological condition investigation, finite element seepage calculation and Darcy's law, we analyzed the water gushing causes and predicted water inflow of Jiaoxi river section of Qinling Tunnel, Water Diversion Project from Hanjiang River to Weihe River. The results showed that in the water gushing initial period, the concentrated leakage passage was filled with fault mud and fault breccia, and the flow was seepage. The initial water inflow amount obtained by finite element numerical calculation was very close to the actual water inflow amount. In the steady period, for the piping failure occurred in the concentrated water leakage passage, the simulated water inflow was 1671.55m3/h, closing to the actual maximum water inflow of 1700m3/h. The research results can be applied to the water inflow calculation in tunnel engineering with similar hydro-geological conditions.