Abstract: In view of the bracket type selection problem of the 40307 working face in Xiaozhuang Coal Mine, a research is conducted on the bracket parameters by adopting load estimation method, analogy method and others. Through load estimation method, the required support strength of the bracket is calculated to be 1.09 MPa. Referring to the mining experience of nearby mining areas with similar geological conditions, the estimated support strength of the bracket reaches 1.65 MPa, and the actual measured maximum working resistance of the 40205 working face is 16 688 kN. The ZF18000/23/42D type four column support shield-type top coal caving bracket is finally determined for the 40307 working face in Xiaozhuang Coal Mine, which can achieve efficient collaborative operation with the existing MG500/1330-W type electric traction shearer and SGZ1000/2×1200 type scraper conveyor in the mine, ZFG18000/25/40D anti four-bar linkage transition bracket is adopted. Aiming at the problems of underframe sinking and difficulty in bracket shifting of the fully mechanized mining hydraulic support that are prone to occur under the soft floor condition, the bottom lifting mechanism is optimized in the structural design for adaptive transformation. The underframe sinking rate is decreased by 45%, the bracket shifting efficiency is improved by 30%, and the application effect is good.