Jiubu tunnel leakage is of fissure seepage under pressure conditions, mainly for seepage at local ballast bed and local sidewall structural joints. This railway line has been put into traffic operation for years, the leakage is increasing day by day. In summer, ballast bed wet traction caused by local water accumulation and walking board wet traction caused by seepage at side wall would appear. The combined process of dredging and plugging is adopted, that is by drilling water conducting hole to lead the confined water out of the side wall masonry to the collecting wells and setting tubes to inject glue for plugging, good results have been achieved.