BPS28,which was a kind of antagonistic microorganisms against many plant pathogens,was isolated from soil by Biotechnology Research Center,Academy of Agricultural Sciences of Jilin Province.In this paper,the inhibition spectrum and stability of BPS28’s fermentation production were confirmed.The re-sults showed that it had better activity to twenty-one kinds of plant pathogens and its inhibition rate to Rice Blast was more than 75% in our experiment.It was sensitive to temperature and was steady-going to illumi-nation.It was steady at pH 3-7.It was not suitable for keeping in room condition,but it can be stored for about 1-6 months in 4℃ refrigerator.