Abstract: In this study, six strains with potassium-dissolving ability were screened from the soils collected from a K-feldspar mining area . One of them, which named JX-10 strain was identified as a kind of bacterium, by 16 S rRNA gene sequencing. Simultaneously, the optimization of potassium-dissolving were also discussed. The results show that, the JX-10 strain had an obvious dissolution effect on K-feldspar. The optimum conditions for the JX-10 strain to remove potassium from K-feldspar were as follows: cultured at 28 ℃ for 10 days, pH value of the culture medium of 5.0, 60 mL medium in a 250 mL conical flask, and 160 r/min shaking speed on a rotary shaker. The K-feldspar concentration and granularity, inoculation volume, ammonium sulfate dose were 2 g/L, 0.03 mm, 25%, 0.2 g/L, respectively. Under the above conditions, the highest the potassium content and corrosion efficiency reach to 23.32 mg/L and 8.36%, respectively.