Swallow fish is a kind of fish that is sensitive to water quality requirements. It should live in clear and oxygen-rich water to ensure health and growth. In swallowtail culture, it is very important to ensure the cleanliness and stability of water quality. Excessive pollutants in water or excessive feeding will lead to the deterioration of water quality, inhibit the growth of Papilio, make it easy to get sick and increase the mortality rate. In order to maintain good water quality, farmers should regularly detect water quality parameters, such as pH value, ammonia nitrogen and nitrite, and take corresponding measures to adjust and improve water quality.