The development of mining support technology can be divided into two aspects: ① the lane support means from the early wooden shed beam support → I-beam support → swan wall → U-beam support → various forms of mixed support → anchor network cable support; ② working face roof support from the wooden shed beam → I-beam → various forms of mixed support → friction strut → various forms of mixed support → monolithic hydraulic strut → synthesis mining bracket development process, the development process. During this period, it has experienced 30 to 50 years of development. Due to the insufficient, unbalanced and unstable support strength of the monolithic pillar to the roof, the driving and control strength of the overall support of the working face to the roof rock layer is extremely unstable, inducing the vertical and horizontal range of the development of the roof high rock shaking and subsidence off-layer changes, the fluctuation is fast and high, and the height of the three bands of the overlying rock layer of the mining area subsidence off-layer is high(especially the height of the II and III bands), and the pressure of the mine shows the relatively intense characteristics, seriously affecting the stability of the surrounding rocks of the quarry. It seriously affects the stability of the peripheral rock of the quarry. Obviously, monolithic column and synthesis mining stent to maintain the stability of the working face roof and the ability to control the essential difference, we cannot treat and utilize the laws and characteristics of the two, and cannot be mixed into one.