The Open-loop Circuit Cooling Tower is equipped with: water distribution system, fills as heat exchange layer, drift eliminator, water collecting basin at the bottom, and axial fan at top of the side. When working, the high-temperature working fluid is sprayed evenly on the packing by the nozzle of the water distribution system, and the air enters into the equipment from the top of the upper fills and the side of the lower fills after the air is induced by the axial fan. The fills enhances the air flow, increases the heat tranfer area between the process fluid and the air, and improves the convection heat tranfer. High-temperature working fluid enters into the top of the equipment and flows out at the bottom of the water basin after heat exchange. the hot air takes the heat from processing fluid and carries part of the droplets go through the drift eliminator, the droplets in the air are collected by the drift eliminator and collected into the basin at the bottom of the equipment.