Returning straw to the field is currently the main treatment method for straw, which reduces the environmental pollution caused by the burning of straw, and also improves the structure and fertility of soil. The uniaxial RBR with the function of forward-rotation is generally used in the operation of the returning straw to field presently. However, the effect of returning straw to the field and the quality of rotary tillage are poor, which affects the seed germination and emergence (Yonglei et al., 2013;Haishui et al., 2015). Although the biaxial straw returning cultivator (SRC) has a good effect of returning straw to the field, the cultivator has a long longitudinal structure, which causes poor stability of field operation, and affects the quality of rotary tillage. The CSRC, which is widely used in southern paddy fields, has the advantages of good effects of returning straw to the field and high quality of rotary tillage. However, the horizontal CSRC still uses the standard forward-rotating rotary blades at present. The arrangement of the rotary blades is the same as that of the forward-rotating rotary blades, which results in the problem of that the power consumption of the counter-rotating RBR being significantly higher than that of the forward-rotating RBR.In recent years, many scholars have explored the energy consumption and working performance of SRC. Because the DEM can be used to simulate the formation and destruction of contact between granular materials (Li et al., 2016;Zeng and Chen, 2016), it is suitable for simulating the interaction between rigid body and elastomer (Huimin, Changying and Chandio et al., 2016; Huimin, Changying and Tagar et al., 2016). The DEM has been widely used in the study of the interaction between of straw, soil and RBR. Chandio et al. used the DEM to establish a simulation model of the interaction between straw, disc plough and soil, and analyzed the displacement, acceleration and displacement changes of soil particles and straw particles during the work of the tillage (Farman, 2013). Momozu et al. deeply carried out research on