Anaerobic granular sludge is a aggregate of high-activity anaerobic bacteria formed in Treatment of organic wastewater. As a microecosystem, it is rich in various anaerobic microbial populations and have Self-balancing performance. It can degrade Various organic pollutants in The original wastewater. It can be used as a triggering of anaerobes in high concentration organic wastewater treatment system. In fact, granule sludge is a form of microbial immobilization, appearance as regular round or oval and color are black or dark gray, with high intensity and good slurry separation and good settling property, usually particle size is 0.3～3mm, even 3.5mm, Density is 1.04～1.08g/cm3, slightly heavier than water, with good settling performance and Methanogenic activity.