Abstract:Anaerobic ammonia oxidation(Anammox) is one of the highlights in the microbiology and environmental research. Anammox is the metabolic function of anaerobic ammonium oxidation bacteria(AnAOB). Different from aerobic ammonia oxidizing bacteria(AAOB), AnAOB has its characteristics in phylogenetics, cytology, physiology, etc. Especially, it has the unique organelle called anammoxosome. Anammoxosome is the place where the metabolism takes place. The research of anammoxosome is the basis to figure out the anammox performance. This article discusses the composition, structure and function of the anammoxosome.