Aiming at the pollution control and ecological restoration of cage aquaculture in Yangcheng Lake, application design of the ecological dam for individual farmers is conducted, and technical and economic evaluation is carried out to lay the foundation for its promotion and application. The design is based on the preliminary pilot test study. Firstly, the individual structure of the ecological dam is optimized. On this basis, the required area of the ecological dam is calculated according to TN pollution load, and the site layout plan is considered. Finally, the technical and economic evaluation is conducted based on this design. The optimization design of the ecological dam mainly includes: the combination of the embedded bacteria and the elastic filler, enhancing its water purification ability, and designing the clam shell structure for the crab to improve its survival rate (10%); according to TN pollution load, the area of the ecological dam designed for single-family farming (6 667 m2) is 1 344 m2, accounting for 20% of the culture area; the one-time construction cost is about 200 000 yuan, and based on 8 year depreciation, the operating cost is about 30 000 yuan and the annual income is about 50 000 yuan. If the scale of application is expanded, the costs can be further reduced.