Abstract: In order to shorten the start-up period of Anammox bioreactor,the nitrogen removal efficiency of a Anammox sequencing batch reactor(SBR) in start-up period was investigated,and at the same time,the induction effect of Anammox bacteria with high Anammox activity and the characteristic of growth in aggregate of Anammox bacteria in the SBR were analyzed.According to the result of present study,it shows that quorum-sensing also exists in Anammox bacteria.At last,two methods to accelerate the startup of Anammox bioreactor were proposed,that is,adding Anammox bacteria with high Anammox activity and adding suitable carrier to the reactor.