Heluoshan tunnel, one of the control works on DaliLijiang railway, has such geological disasters as water and mud gushing. The principle of "taking water sealing as dominant measure and releasing the water with limitation" is determined on basis of the actual situation of the sudden water gushing in one steep inclined shaft of Heluoshan tunnel. Detailed technical parameters and methods of fullface pregrouting are established and adopted and satisfactory effects are achieved. The details of the fullface pregrouting are presented in the paper, which can provide reference for similar projects in the future.