Based on patent retrieval and analysis with the Thomson Innovation (TI) database, the international development trend of recirculating aquaculture system (RAS) is investigated. The current international research and development focus for RAS are purification technology, aquarium structure, water temperature control, and biological filters and filter devices. Meanwhile, China has focused on fish tank and pond design, biological filters, RAS devices, oxygen supply and motor shaft, etc. Though some of the international research focus in RAS are new for China, the number of Chinese patents is greater than the international average and has grown rapidly in recent years, indicating a positive developmental trend in the near future. This paper provides recommendations for improving efficiency, quality, safety, and environmental protection of sustainable aquaculture as well as further measures for the development of RAS in China.