121.6 N。Based on the analysis of FEM (finite element method) and DEM (discrete element method), the research considered that the DEM is feasible and superior to the FEM in simulating the interaction between wheel and the lunar soil. The model of the interaction between rigid wheel and lunar soil has been set up. The system of soil bin was simulated by means of software PFC2D. Parameters of the lunar soil for DEM model were confirmed in the biax test, and the angle of internal friction was 42°, the cohesion was 1.554 kPa, the Poisson radio was 0.41, and the Young's modulus was 77.5 MPa. The DEM model of the slip, sinkage, and draw-bar pull were found, which were checked out by the soil bin test. The results showed that the trend is consistent. Finally, the traffic ability of nonrug-wheel and the rug-wheel were compared, and the results showed that the slip radio was zero of the rug-wheel and was 1.8% of the nonrug-wheel under the tractive resistance was zero, and the draw-bar pull was 121.6 N of the rug-wheel and was 7.71 N of the nonrug-wheel, when the clip ratio is 10%. 