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A strain NBT capable of dissolving silicate minerals and promoting plant growth was treatedwith UV+LiCl. Thirty-two mutants tolerable to 2% NaCl solution were obtained. However, through the sur-vival experiments in high osmatic pressure, high temperature and different acidities, two mutants of NBT-6and NBT-19 were finally obtained. They could survive from 10 % NaCl solution and tolerate 55℃, acidic (pH4) and alkalic (pH 10) conditions. The mutants had the same ability to release K from silicate minerals as thestarting strain NBT. Pot experiments with chili and cotton showed that both the mutants developed in the rhi-zosphere soils. The available P and K contents in the rhizosphere soils and plant biomass increased through in-oculating these bacteria.