With the development of shield tunnel technique and the solution of many problems, the problems of segment cracking, assembling difficulties and waterproof trouble caused by the dislocation more seriously affect the construction and operation. Taking the west extending section of Shanghai Metro Line 2 as the background, a simple, direct and feasible method - dial-angle sheet distance measurement method is innovatively proposed to measure the segment dislocation. The data collected by this method can reflect the developmental rule of segment dislocation better, which has the far-reaching practical significance for the in-depth study and construction control of dislocation.