Abstract: Aiming at the characteristics of high level of COD Cr , BOD5 and SS mass concentration, low level of BOD5/COD Cr and serious water pollution in the Haixin River, the treatment technical line was optimized under the premise of minimal treatment cost. An integrated treatment programme combining flocculating settlement with man-made marshland was proposed, and corresponding static and dynamic experiments conducted. The experimental result shows that adopting poly-aluminum chlorate as flocculate agent has the good qualities of removing pollutants and resisting low temperature outside. The man-made marshland will plant bulrush, etc. which also have the capacity of treating pollutants in winter.