Abstract: This paper's purpose is to research the mechanism of renovating rupture shaft utilizing injection method on the basis of the analysis of actual measurement data.In this paper,some typical shafts that are renovated by grouting method are analyzed.The raise reason of soil around shaft producing from grouting is researched.The mechanism of shaft deformation because of grouting and the real reason of shaft are analyzed.The difference between surface injection and the injection behind shaft is compared.It is showed that the essence of grouting method is the water plugging effect.This result has important role with making injection project and saving harnessing cost.Besides,it gives an important base for the mechanism of shaft rupture.