The study on dissolution of potassium from feldspar powder by fermented broth and the metabolites of the strain NBT was carried out in shake flask.The results showed that K, Si, Al from feldspar was activated by fermented broth cultured for 48 hours.The contents of K, SiO₂, and Al₂O₃ in the fermented broth were 184.1, 39.8 and 12.6 mgL^-1 respectively after shaking with feldspar in it at 28 for 10 days and were 106.1%, 63.1% and 133.3% respectively over that the control of sterilized fermented broth; In addi tion, a lot of organic, ammonia acids and capsular polysaccharide were detected in the fermented broth.The shake flask study showed that the metabolites had the potential of dissolving the feldspar and the contents of K in the solution were 110.8 mgL^-1 for organic acids, 84.9 mgL^-1 for ammonia acids and 19.7 mgL^-1 for capsular polysaccharide.The effect of K release was increased by 62.2% by the mixed metabolites.The dissolution of feldspar was through the acid dissolution action and chelation of the metabolites.