Abstract: Spray cooling systems can relieve heat stress in dairy cows, but water efficiency needs to be improved considering water saving and environmental protection. This paper mainly reviewed the influence of several typical heat stress state discriminating conditions, environmental factors（temperature, humidity, wind speed, and thermal radiation）, and spray parameters（water droplet particle size, spray time and nozzle flow rate） on spray cooling effect, in order to provide reference for the development of automatic spray control system.