With the development of microbial technology, compound microorganism fertilizer has become one of the most popular problems now. The microbial functional community as the most important parts of compound microorganism fertilizer was the key technology in fertilizer production. In this paper, the phosphate solubilizing microorganism, nitrogen fixation microorganism and potassium dissolving microorganism have been screened, and their activities have been studied. The primary mixed fermentation ex...