Piston ring is a large outward expansion elastic deformation of the metal ring, which was fitted with the appropriate section to the circular bed. Back and forth movement and rotation of piston rings, rely on gas or liquid pressure on the poor in the outer ring and cylinder surface, as well as ring and ring groove between the side of a seal. Chongqing market in the piston ring divided into two categories: compression ring and oil ring. Central compression can be used to seal the combustion chamber of compressed air; oil ring is used to curettage spare cylinder on the oil. Fuling District of Chongqing Zhanyang-Piston Ring Co., Ltd. is located in Fuling District of Chongqing Municipality, is a professional design, development, production and marketing of the piston ring known enterprises, the company produced in Chongqing piston ring market share very high, is Chongqing Piston Ring in the field of one of the most well-known enterprises.