The remaining resources of animal husbandry are the livestock wastewater that is still rich in organic components and nutrients available to plants such as nitrogen, phosphorus, and potassium after being treated by a three-stage treatment system. These available resources are used to cultivate algae and purple photosynthetic bacteria to maintain clams. The good ecological environment of the pond and the food of clams can reduce the feeding of clams and reduce the cost of breeding. Through the operation of the experiment, the model of applying the surplus resources of animal husbandry to clam farming is established.