There are many faults and sericite slate sandwich development in initial diversion tunnel of Lianghekou hydropower station, especially f25, f3, f8 series, f4, f28 and other faults are composed of multiple secondary dislocation bands with wide fracture zone, poor rock integrity and unstable surrounding rocks. In order to ensure the safe operation of the diversion tunnel, Ⅳ and Ⅴ-class surrounding rocks inside the diversion tunnel should have consolidation grouting; and according to the requirement, grouting test should also be made. The paper mainly introduced the process of consolidation grouting test construction.