NOVELTY - A stable surface flow wet land comprises a wet land bed body, a water distributor, and a stable surface flow pond which is earth and stone structure arranged on the wet land bed body. More than one stable surface flow pond is connected together through the water channel. The stable surface flow pond is provided with a baffle. The stable surface flow pond is the flow turning type stable surface flow pond, the water fall type stable surface flow pond, or the flow guide type stable surface flow pond. Multiple flow turning plates A are arranged in the flow turning type stable surface flow pond.    USE - Stable surface flow wet land for silt prevention and sewage treatment.    ADVANTAGE - The sewage after pro-treatment flows into the stable surface flow pond through water distributor. Some portion of the suspended particle in sewage can deposit while another portion of suspended particle is stopped by matrix and the roots of the plant. The suspended particle, the decayed matters, nitrogen, phosphorus in the sewage are removed, the sewage can flow out through the water outlet tube.    DETAILED DESCRIPTION - A stable surface flow wet land comprises a wet land bed body, a water distributor, and a stable surface flow pond which is earth and stone structure arranged on the wet land bed body. More than one stable surface flow pond is connected together through the water channel. The stable surface flow pond is provided with a baffle. The stable surface flow pond is the flow turning type stable surface flow pond, the water fall type stable surface flow pond, or the flow guide type stable surface flow pond. Multiple flow turning plates A are arranged in the flow turning type stable surface flow pond, and can divide the flow turning type stable surface flow pond into multiple-grade flow turning region. Each grade of flow turning region can form a function region. Different matrixes for planting different plants can be arranged in each function region according to the actual process requirement. The baffle is vertically arranged at the opening end of the flow turning plates A and the flow turning type stable surface flow pond uses the lower water in and upper water out or lower water out and upper water in mode. Multiple flow turning plates B are arranged in the water fall type stable surface flow pond, and can divide the water fall type stable surface flow pond into multiple function regions. The baffle is vertically arranged at the opening end of the flow turning plate B. The gradient down liquid level difference can be formed between the function regions, each provided with different matrixes for planting different plants. The flow guide type stable surface flow pond uses the flow guide walls for dividing the flow guide type stable surface flow pond into multiple function regions. The baffle is vertically arranged on the flow guide wall, and each function region is provided with different matrixes for planting different plants. An INDEPENDENT CLAIM is included for a sewage treatment method.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of the stable surface flow wet land for silt prevention (Drawing includes non-English language text).