Abstract: Eleven inorganic phosphorus-dissolving bacterium strains were screened out from 83 Bacillus saved in the lab.Three bacterial strains with the larger ratio of hydrolysis circle diameter to colony diameter were screened out by the plate method.One strain ZP with the strongest phosphate-dissolving ability was screened out from the there strains by liquid submerged culture.In order to provide theoretical basis for the production of phosphate preparations,the there strains were cultured by solid fermentation to study the relationship between the phosphate-dissolving ability of strains and the different culture medium formula and fermentation time.