The limiting wear tensibility rate greatly influences the operational performance of chains. It is an important measure to establish the assessment criterion to ensure the reliable operation of mechanical products. Based on the theories of statistics, an assessment method of chain wear-resistant reliability was proposed, which could easily adjust the sampling scheme according to the types of chain transmission, so as to satisfy the needs of assessing the reliability of different mechanical products. The research shows that by using the reliability based on operational life or limiting wear tensibility rate as assessment index, assessing cost is not changed, and more information on reliability is obtained.