Abstract: The settling and dewatering characteristics of the anaerobic sludge from the anaerobic digestion of sweet potato alcohol lees, and the seleetion of the flocculants and its optimum addition quantity have been studied. The results show that the addition of the morganic high molecular polymers poliferrisulfate between 1700 to 2500 ppm leads to the reduction in the specific resistance to the range of 0.1-0.4×10⁹S²/g, which makes the mechanical dewatering of the anaerobic sludge most effective. The dewatered sludge can be used as a kind of high efficient fertilizer. According to the previous study, 1 m³ sludge containing 4% solid materials is equivalent to more than 20 kg N.P.K complex fertilizer.