In mining sizer is one of the most important components, especially in the mineral processing link crusher production costs will account for nearly 40% of the total cost of mineral processing, so in the design and manufacture of the crusher should actively do a good performance analysis of the crusher, through the mechanical optimization of the crusher in order to effectively improve the productivity of the crusher. mineral sizers is a relatively new type of crushing equipment. Compared with traditional crushing machines, mineral Sizers has a simple structure and less over-crushing phenomenon. It can play a good role in the coarse powder of limestone, coal, etc. On the basis of analyzing the structural characteristics of mineral sizers, this paper will analyze and explain how to optimize the structure of roll tooth profile and roll tooth spacing in mineral sizers. 1.Mineral sizers is a new type of crushing equipment, which has obvious advantages over the traditional jaw crusher and hammer crusher. Because of its structural defects, the crusher has a high probability of blockage in the working process and is easy to cause the broken minerals to be crushed. Compared with the mineral sizers, the hammer crusher has a lower crushing efficiency, while the impact crusher has a complex structure and higher cost despite its higher production efficiency. mineral sizers are mainly used in the crushing of coal mines, limestone and other minerals, and have a wide range of application prospects in domestic mines. In the new era, we should actively do a good job in the design and optimization of equipment to meet the growing needs of domestic use. mineral sizers are widely used in coal preparation plants, which can achieve better crushing effect. At work, the crushing of coal and other materials is achieved by cutting and squeezing the crushing teeth on the two pairs of rollers, which improves the crushing efficiency and avoids the occurrence of over-crushing defects. The core of the mechanical structure of the equipment is: two rolls. One roller is supported by a fixed bearing and rotated by an electric motor, while the other stick is supported by another fixed bearing. In the process of operation, the pair of rollers complete the shear crushing of the ore by cutting the material.