With permeating spraying, water is evenly sprayed directly onto the bodies of the dairy cows. Water drops permeate the hair and moisture the skin and then the spraying will stop. The fans will help evaporate the water on the bodies of the cow before next spraying. The evaporation of water on the cow bodies will take away the heat from the cow. In this way, heat stress of the cow can be prevented and spray cooling system helps to cool down the cows.