The paper introduces the material characteristics and construction method applied in CGM grouting, and this technology was utilized in the interface treatment between concrete and steel tube among the powerhouse intake section in Wuxikou water conservancy project. The result shows that the grouting material has the advantages of early fast strengthen with high ultimate strength, shrinkage free and micro expansion, high fluidity and vibration free, also the process is simple, quick and performance well. The technology can be of certain reference value for other projects.