The functions of high-pressure consolidation grouting for hydraulic tunnel are strengthening the tunnel wall rock, sealing rock cranny around the tunnel, increasing the wall rock’s integrity and capability of anti-distortion, strengthening the wall rock’s impermeability and long-term seepage stability. This article has mainly introduced the tests and the effects of high-pressure consolidation grouting works for diversion tunnel without concrete liner, and provided the basis for grouting design and construction of the tunnel engineering.