Biomass solid wastes containing lignocelluloses become more than 1 billion tons in China, 2010. If biomass solid wastes can be degraded into fertilizer, it would greatly promoted economic and social improvement. On the basis of experiments, aeration, moisture content, particle size, fermentation temperature and pH were the main factors affecting mixing bacterial fermentation. After understanding the microbial characteristics, the process was designed by considering the costs of equipment and production and also the main factors mentioned above.