In order to effectively protect the groundwater resources and rationally exploit mineral resources, curtain grouting is the main method for water control in mine. But in the cave development section, because of strong permeability and large grouting volume, it is difficult to come up to the grouting finished standard. According to the cave features of curtain grouting engineering in zhongguan iron mine, caves were divided into different categories; on the basis of the test, grouting adding materials were chosen. The paper theoretically introduced caves grouting method and transformation process of slurry spreading from “pipe flow” to “seepage” with field operation description.