This paper introduced the surface flow starting with the concept of artificial wetlandsIn and the terrain and soil conditions on the basis of nature.Then it combined the actual case with the surface flow constructed wetlands treatment system’s preliminary design

detailed design and final design concept.Especially on the final design of the space

aspect ratio and the line speed

area

the cofferdam and flood control

power pumping equipment and inlet-outlet control structure

plants and planting

and other factors were summarized in this article.