In this study were designed, built, and tested a system of cooling tower by cooling tower design that has an area equal to cut Packing 7x7 inch-high 14.6 inches and test the system by controlling the flow rate of the incoming hot water temperature, incoming water heating. By controlling the flow rate at 130 ml per min, 140 mL/min and 150 ml/min and temperature control of water at 50° c, 60° c, 70° c and 80° c in every flow.