It mainly contains a large number of facultative microorganisms and total nitrogen degrading microorganisms after domestication. Total nitrogen degrading organisms are the main force of the biodegradant, which have the characteristics of rapid propagation, strong adaptability and high degradation efficiency. Denitrification is the main section of denitrification. The main force of denitrification is denitrifying bacteria, that is, facultative microorganisms. How to improve the growth rate and activity of facultative microorganisms and denitrifying bacteria is the key. Through a lot of research and biological acclimation, our company has cultivated microorganisms with strong adaptability to total nitrogen and high nitrogen removal efficiency. At the same time, we have added the necessary nutrients to meet the growth of microorganisms. According to the different pollutant content of different urban sewage, we have acclimated different adaptive microorganisms to reduce the adaptation period of microorganisms and improve the removal rate