Abstract: Aiming at the complicated problems of the wear rule of middle trough of the armoured conveyor under severe condition, the wear test between middle pan with the mixture of the coal, gangue and water is carried out.Using the statistical principle, the interaction technology and the modern friction, the experimental data obtained were studied and analyzed.The results show that the wear loss increases with the increase of contact pressure and sliding speed.When the contact pressure is low, the wear change is more intense, but when the contact pressure exceeds 0.004 9 MPa, the variation tends to be gentle.Under the constant contact pressure and sliding speed, the wear loss decreases with the increasing ratio of water, coal and gangue; The wear mechanism of the plate are mainly abrasive wear, adhesive wear, corrosion wear and fatigue wear, distributed in the mild, moderate and severe wear region of wear mechanism distribution diagram of middle pan.When the contact pressure is 0.004 9, 0.005 7 MPa, and sliding velocity is 1.48 m/s, 1.9 m/s respectively, the wear region and its mechanism of middle pan change.