Abstract: In order to solve the problem of large convergence and continuous deformation of roof, we research the movement law of roof strata in crossheading of 11021 working face of Zhaogu Coal Mine, and the result indicates that roadway with large deformation in deep shaft has large deformation amount and long deformation duration, and the existing "anchor bolt and anchor cable" support pattern plays limited role in controlling the deformation of roof. Through tensile test, mechanical analysis of the bolt and mechanical analysis of the roof support, it is concluded that anchor bolt with good extension performance can adapt to the deformation of surrounding rock better, and support technology of extension anchor bolt is presented accordingly. Experiments conducted in crossheading of 11021 working face of Zhaogu Coal Mine indicates that the roof deformation reduce about 20%, and the time reduce 40% from excavation of roof surrounding rock to reach stability by employing the support technology of extension anchor bolt, and the roof convergence rate reduce significantly than the original support scheme, and the support effect of extension anchor bolt is good.