Abstract: Aiming at the specific geological mining conditions of 8301 working face, clamp gangue roof load estimation method is proposed through the calculation principle and results of 3 kinds of support working resistance determination method at traditional fully mechanized caving face with the macroscopic damage mechanics method, back analysis of numerical simulation method and statistical experiment method. With the combining of field measurement, it shows that clamp gangue roof load estimation method can reasonably determine support resistance of fully mechanized working face under complicated geological conditions, and the hydraulic support of ZF13000/25/38 meets the production requirements.