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The new type of plastic toothed chain is a plastic toothed chain with internal and external composite meshing, and it is mainly composed of chain plates, guide plates, and pins. The performance of this new type of plastic toothed chain has been improved over that of traditional plastic toothed chains; it is suitable for operation at high speeds, with variable speeds, and under varying loads. It reduces operating noise, minimizes the effects associated with the polygonal shape of the plastic teeth, and enhances the efficiency of power transmission. The new type of toothed chain combines the advantages of plastic toothed chains with internal and external composite meshing. During the internal and external meshing process, the gear profiles on the inner and outer sides of the chain links, along with the generatrices on both sides of the pins, take turns bearing the load, thereby reducing wear on the pins and chain links of the plastic toothed chain, as well as minimizing wear on the teeth of the sprockets used with this chain. The performance of new toothed chains is improving and wear is decreasing, but the wear of plastic toothed chains remains relatively severe. We can approach this from two aspects in terms of reduction methods. First, increasing the hardness of the pin surface and reducing its roughness can effectively improve the wear resistance of plastic toothed chains. Secondly, under lubricated conditions with a medium present, the wear of plastic toothed chains is primarily caused by abrasive particles, although there is also some minor wear and fatigue ； It is advisable to choose a plastic toothed chain with a relatively high lower bainite content of 70%-80%, as this gives the chain better resistance to fatigue wear and abrasive wear.