A PGPR strain named B-1 was separated from foreign products,the morphology of the cell and the clony was observed and physiological and biology-chemical reaction were made.DNA G+C mol% was 47.2% by the method of thermal denaturation,so the strain was identified as Bacillus brevis;The height and the fresh weight was studied by the experiments of wheat inoculated with it.The fresh weight of wheat was increased by 10.64% and the plant height was increased by 6.75%.The maize pot experiment results showed that s...