Chondroitin sulfate calcium salt is based on chondroitin sulfate sodium salt sodium ions replaced by calcium ions. Acid mucopolysaccharides extracted from cartilage tissues such as laryngeal bone, middle nasal bone and trachea of pig, cow and other animals or from fish cartilage. The basic group of chondroitin sulfate calcium salt is divided into chondroitin sulfate A, C and various mixtures of chondroitin sulfate. Calcium chondroitin sulfate is white or yellowish powder, slightly salty, odorless, moisture-inducing. Its aqueous solution is viscous. Soluble in water, insoluble in ethanol, acetone and other organic solvents. Chondroitin sulfate for the treatment and prevention of middle-aged and elderly calcium loss, prevention of cardiovascular atherosclerosis, and adjuvant treatment of hepatitis has a very good effect on beauty, reducing blood lipids and so on. At the same time, it has a good effect on the treatment of arthritis and low back pain. The molecular structure is as follows: (C14H21O14NS)n