Abstract:During the weakened deformation stage of pressed opst,the energy variation relationship of press- pressed post system is analyzed. The expressions are obtained for the displacement of stopping point of pressed post with unstable failure,the elastic energy relief amount of press and the inertial force imposed on press with brittle failure of pressed post and the largest displacement of press. These mechanic parameters are calculated and analyzed by quoting the load-displacement expression of pressed concrete post with high strength. The deeper knowledge is obtained for rockburst and rockburst strength of pillar,alley wall of mining and coal wall of stope.