Abstract: The moving ore-rock block in the orepass will collide with the wall of the orepass and lead to the impact damage of the orepass wall.The study of the movement law of ore or rock block in an orepass is beneficial to reduce the collision rate between the ore-rock block and the orepass wall.Based on the kinematic principle，the relation model of the initial direction of the ore or rock block movement and its motion law is established，the movement track equation of the ore or rock is obtained，the condition of collision with the orepass wall during the movement of the ore or rock block is established，the calculation formula of the first time collision point of the ore or rock block and the orepass wall is obtained，and the influence of the initial movement of the ore-rock into the orepass is studied.It is found that:① the diameter D of the orepass， the initial velocity [v0] and direction [α] of the ore or rock block are the main factors affecting the collision between the ore or rock block and the orepass wall；② when D and [v0] remains unchanged， the value of collision position h1 increases with the increase of [α]，and vice versa，the smaller the value of h1 is； ③ when D and [α] remains unchanged， with the increase of [v0]，the value of collision position h1 is smaller，and on the contrary，the greater the value of h1 is；④ when and remains unchanged， with the increase of D，the value of collision position h1 is larger，and on the contrary， the smaller the value of h1 is.The study results further show that the collision probability between the ore or rock block and the orepass wall could be reduced by properly increasing the diameter of orepass，selecting the appropriate structure and reducing the speed of the ore or rock block entering the orepass，which is beneficial to reduce the degree of impact damage of the ore or rock block.

Key words: ore-rock block moving, movement track, vertical orepass, orepass wall, impact rule