Chondroitin sulfate belongs to a kind of medicine, the main effect of ingestion is to reduce the pain in the joint, and it has obvious improvement effect on the symptoms such as joint effusion, joint cyst and knee joint stenosis. The main mechanism of action is to absorb proteoglycan through its own water, so as to thicken the cartilage, which has a good improvement effect on many symptoms caused by the thinning of the shut-down cartilage. Moreover, chondroitin sulfate can increase the protective effect of corneal fibrogen, thereby increasing corneal thickness and reducing inflammatory absorption.