Abstract: With the help of curtain grouting engineering of Nanlizhuang Iron Mine，through the drilling core fissures' statistics，the impact of three fissures occurrences such as the horizontal，oblique and vertical karst fissure occurrences on grouting diffusion effect were analyzed.Combined with the structural development characteristics of the mining area，the influence of the combination of curtain line and karst fissures on the grouting construction and engineering quality was evaluated.The study provides the basis for the design and construction of similar projects and water plugging evaluation.

Key words: Mine water disaster, Curtain grouting, Karst fissure occurrence, Water plugging