The waste water goes through the suspending media of MBBR reactor, form the biological membrane on the surface of the media gradually, with the action of the microbial on the biological membrane, the waste water is purified. The media can move freely in the reactor with the mixing of the water; for the aerobic reactor, the aeration will make the media move; for the anaerobic reactor, mechanic mixing will make the media move. Our MBBR media provide high surface area for the MBBR process, has better treatment effect compared to traditional media.