Abstract: Due to studying on the relation of the supporting frame and the surrounding rock of fully-release mining in large mining height stope，the paper analyzed the movement rule，internal force，and displacement of the hydraulic supporting frame -roofoverlying rocks and the falling rock mass，and the movement rule of the dynamic balance arch and the multispan beams under the arch to determine the working resistance of the hydraulic supporting frame and the overlying rocks.Through the simulating experiments in Lab，its movement rule is verified.Meanwhile，with the numerical simulation based on FLAC^3D，the damage mechanics model is used to simulate the variation of the internal force in actual mining of the roof- the overlying rocks of the large mining bench and get its distribution so as to affirm the structural system method.

Key words: Structural system, Internal forces calculation, Movement rule, Hydraulic supporting resistance