Abstract:By directed against 6 m thick coal seam in mining area and the “Twohard” coal seam conditions, the mechanical relationship model between the support and the surrounding rock of the working face was established. According to the onsite experience in other working face of No.12 coal seam, coupled with the mining pressure monitoring display and the corresponding calculation formula, the working resistance of support was established. In order to ensure the support strength of the support, the support ability of support and than the pressure of supporting roof were calculated. Based on three dimensional (3D) modeling software of SolidWorks and analysis software of COSMOS, the virtual prototyping of hydraulic support was established and carried on dynamic simulation analysis. The support four connecting rod mechanisms design of double twisting lines was optimized. The relationship between top cutting fore and mining height, and the relationship between support strength and mining height were analyzed. The results show when the top cutting fore reached 7 222.78~8 235.95 kN, the support has a better roof cutting and supporting effect, the better variation distance of the beam end and support is 52.011~63.298 cm, and it has a higher efficiency when the support strength reached 1.26~1.36 MPa.