Abstract: In order to improve transport efficiency, reduce the wear of EPB shield screw conveyors, and reduce power loss in the transport process, this paper proposes an optimization method for structure parameters of shield screw conveyors by combining discrete element software EDEM, NSGA-Ⅱ optimization algorithm and entropy weight TOPSIS method. Firstly, the discrete element software EDEM is simulated to obtain the performance indexes of mass flow rate, average spiral wear and operation power of a conveyor according to the designed orthogonal test, and the reliability of the simulation is verified. Secondly, Matlab software is used to fit the simulation data, and the performance index function between multiple structural parameters is established. Finally, NSGA-Ⅱ algorithm is used to optimize screw conveyor parameters, the Pareto frontier solution set is obtained, and the optimal solution is determined through entropy weight TOPSIS method. The results show that the overall performance of the conveyor is the best when the screw conveyor installation inclination angle is 24.69°, the pitch of the screw is 613.25 mm, the inner diameter of the screw is 696.34 mm, and the screw shaft diameter is 211.88 mm. Other conditions being the same, the mass flow rate increases by 10.56%, the screw shaft wear decreases by 8.64%, and the power loss reduces by 6.41%. The research results of this paper have a certain reference value for the design improvement of EPB screw conveyors.