Confined water corrosion inhibitor application in a closed system with ethylene glycol, methanol, ethanol, industrial water as refrigerant of chilled water and hot water system as a corrosion inhibitor with, can also be used in antifreeze, oil tankers, oil tank in aqueous corrosion inhibition, to solve the corrosion problem of the waterline, and is also suitable for central air conditioning chilled water system. Closed water corrosion inhibitor mainly by organic corrosion inhibitors, dispersing agent, nitrite, molybdate which is currently closed system is widely applied in performance excellence of corrosion inhibitor of. The corrosion resistance of carbon steel, stainless steel, copper alloy, aluminum alloy, etc.. Chromate free, no color in the water, reducing the metal material spots phenomenon. To ensure good heat transfer efficiency, reduce operation and maintenance costs, and the operation is very convenient to add liquid products.