The fermentation conditions of Exopolysaccharides (EPSs) PS202 were determined by single-factor test and orthogonal test. From the results, the optimal sucrose content, beef extract content, the growth factor, pH value, shaking rate, temperature and extraction time for the fermentation were 5%, 0.2%, 1.2%, 7.2~7.5, 30 ℃, 200 r/min and 96 h, respectively. Under those conditions, the yield of EPSs was 3.14%.
