Abstract: There are disadvantages for the use of the orignial chemical industry standard（HG/T 3584—1999 Potassium Borohydride） to determine the content of potassium borohydride, such as：1）The addition of potassium iodide reagent（5 g） is too much resulting in wasting；2）The sampling weight of potassium borohydride is 0.2 g，accurately up to 0.000 2 g，but the determined content of potassium borohydride will be decreased when the sampling weight is larger.In allusion to above problems，the original potassium borohydride determination method（HG/T 3584—1999 Potassium Borohydride）was improved： 1）The potassium iodide addition is reduced to 2.5 g from 5 g so as to save the reagent consumption；2）According to the potassium borohydride′s deoxidization characteristics, the sampling weight is limited within a specific range.Experiment results  were satisfied.

Key words: potassium borohydride, potassium iodide, sampling weight