Composite artificial wetland is a comprehensive water treatment system that combines multiple wetland treatment technologies (such as surface flow, subsurface flow, vertical flow, etc.). By simulating the functions of natural wetlands and utilizing the physical, chemical, and biological synergistic effects of substrates, plants, and microorganisms, it achieves deep purification and resource utilization of aquaculture wastewater. Aquaculture effluent usually refers to the discharged water during or after the aquaculture process, characterized by low pollutant concentration, large water volume, uneven discharge, and strong seasonality. In recent years, our company has designed and implemented more than 30 projects for the treatment of fishery aquaculture wastewater, mainly using physical, chemical, and biological methods to ensure that the wastewater meets discharge standards or is recycled.