Abstract: A Study on the characteristics of microorganism for phosphorus removal is the premise of ascertaining the mechanism of biological phosphorus removal. Through the bacterial species identification test the ride analyzes the microorganism characteristics in phosphorus removal biofilm and the function in biological phosphorus removal process.Moreover, it is certain that the dominant phosphorus removal bacterial species is Pseudomonas and then Aeromonas, Bacillus, Micrococcus, Nitrobacter in the submerged biofilm process.