Abstract: Formerly,the breaking of lump coal was very serious during the process of its transfer into coal bunker. Analytical study is hence made of the breaking mechanism of lump coal from the angles of impact and collision mechanics. Based on the result of study,work is made on the renovation of the 2 lump coal transfer points with a larger height difference（ one in the main workshop and the other in filter press shop） using discrete element dynamic simulation technique. The work involves the conversion of vertical chute into a high material receiving spiral chute. Practice shows that the renovation work has led to effective control of breaking of lump coal and noticeable reduction of noise level at coal transfer points,this bringing about,therefore,considerably favourable economic benefit for the plant.