Abstract: combining with a actual example, interrelated technology of grouting on fragmentized goaf groundwork had been researched and actualized. The area should be grouted had been draw, and the position of drill, the same as proportion of material been transfused and techniques should be used had been draw also. The result got from drill designed for checking up showed that the purpose of practice in according with which designed, and the intensity of groundwork been treated will keep the building up safe.