In order to ensure the stability of the foundation of the new industrial plaza of the Julong mine, the superhigh-water material was used to reinforce the goaf after comparing various treatment methods. The technology and process of grouting and reinforcement with superhigh-water material in goaf were developed. The ultra-high water material was made into slurry on the ground and directly injected into goaf through drilling. Many monitoring results after grouting completion indicated that the grouting effect was good, which extends the application scope of ultra-high water material, and achieves remarkable economic and social benefits. This technology has wide application prospect.