A strain of bacteria with high capability of accumulating poly-P was isolated and screened from soils by using the pure culture and blue and white colored screening methods.Identified as Citrobacter freundii and named GM1,this strain could grow normally in either LB,YG or MOPS media with pH ranging from 6.5 to 8.5.The optimal temperature and pH for its growth were 30℃ and pH 7.5,respectively.After incubation aerobically in the MOPS medium for 24 hours,the phosphorus concentra tion in GM1 reached 11.5% of its weight,while the concentration of phosphate in the medium declined from 43.8 to 14.7 mg L^-1,so the phosphate removing rate was 69%.At that time,poly-P granules could be observed in thalli by the poly-P staining method,indicating that GM1 has a high capability of accumulating phosphate.