Abstract: In view of problem that existing lump coal rate research method cannot accurately express behavior of coal particles, an analysis method of lump coal rate on fully mechanized coal mining face based on discrete element method was proposed. Taking MG450/1080-WD type shearer as research carrier, the coal mining process was studied and analyzed, and dynamic model of coal rock particles was established. On this basis, discrete element software EDEM was used for quadratic regression orthogonal rotation combination test, and lump coal rate of the fully mechanized mining face was analyzed. The analysis results show that when drum speed is 38.74 r/min, hub diameter is 233.79 mm, and blade spiral angle is 14.09°, performance of MG450/1080-WD shearer is optimal, the lump coal rate is 36.52%. Simulation and test results of lump coal rate under different rotation speeds and blade spiral angles are compared, and the results show that the trend of lump coal rate is consistent, which proves the feasibility of using discrete element method to analyze lump coal rate of fully mechanized mining face.