GB 12941-1991 is the water quality standard for landscape recreational water. In order to ensure the ornamental and recreational safety of landscape water bodies, the standard stipulates the limits of water temperature, chroma, turbidity, dissolved oxygen, biochemical oxygen demand, ammonia nitrogen and other water quality indicators for different functional waters, covering physical, chemical and microbiological indicators. At the same time, it clarifies the water quality monitoring Frequency, sampling method and analysis and determination specifications. It is suitable for all kinds of landscape lakes, rivers and water bodies for recreational activities such as swimming. It provides guidelines for the management and maintenance of landscape recreational water and helps to create a healthy and pleasant landscape water environment.