It is used as refrigerant (such as frozen brine for refrigerator, frozen brine for ice making and ice stick), antifreeze, automobile antifreeze and fire extinguishing agent. Flame retardant for melting ice and snow, finishing and finishing of cotton fabrics. Used as adhesive and wood preservative. It is the raw material for manufacturing anhydrous calcium chloride. It is used in wall painting and plastering to increase the setting capacity. Rubber production is used as a coagulant. Mixed starch paste is used as sizing agent. It is also used in nonferrous metal smelting. Used as medicine.