Abstract: In view of the serious wear problem of the middle groove side of scraper conveyor at present, the DEM-MBD coupling model of scraper conveyor was used to simulate its transportation process. It is found that in the process of scraper conveyor from no load to full load, the concentrated area of pressure inside the groove side gradually transfers from the lower edge of the groove side to the upper edge of it. And at stable full load, the pressure range of the upper edge of the groove side is 9842~10890 Pa, significantly greater than the maximum pressure of the lower edge of 8742 Pa, which is consistent with the severe wear of the upper edge of the groove side; The force exerted by the scraper on the groove is concentrated on the upper edge of the groove side, and the force ranges from 23950 N to 160350 N, with an average value of 85509 N, which is 30.76 times of the mean force exerted by coal on the groove side, indicating that the wear of the upper edge of the groove side is mainly caused by the rigidly rigid body wear between the scraper and the groove. The curve of the inner side of the groove was optimized, and the results showed that the pressure on the inner side of the groove and the force of the scraper on the groove side were reduced by 19.34% and 42.51% respectively, which provides a basis for the optimization of the groove structure.