Abstract: As one of the main parts of heavy medium cyclone, the guide tube has great bearing on the service life of integral cyclone and it's separation performance. For ensuring continuous operation of the coal preparation plant, analysis is made on the pattern and mode of wear of the lining traditionally used at the inscribed point between the guide tube's inlet(outlet) and the cylindrical part of the cyclone, with an aim to define the main abrasive wearing points of the traditional lining structure. Based on analysis made, a novel-type lining structure is developed through numerical simulation. Study result indicates that the use of the lining with a novel structure can lead to higher wear-resistant capacity of the tangentially connected point of the guide tube and cylindrical part, longer service life and improved separation performance of H. M. cyclone.