Abstract: In order to allow the protection ring of the outlet of a dewatering centrifuge to work with a longer service life, an analysis is made of abrasion mechanism for the protection ring. Following an introduction to the methods for identifying the damage and the principal abrasion factors of its outlet protection ring, the paper makes a comparison of service life of the outlet protection ring using QT600 wear-resistant cast iron, QT600 wear-resistant cast iron+wear-resistant coating and Q235 steel plate clad with wear-resistant ceramics. Study results show that the wear of the ring is mainly attributed to impact abrasion of material and the arc section of the ring is the main worn-out point, as well as the service life of the Q235 steel plate clad with wear-resistant ceramics is more than double that of QT600. the use of appropriate wear-resistant material can help extend the service life of the ring.