Based on soil salinization in vegetable fields of greenhouse,two bacteria (Bacillus mucilaginosus and B. megaterium that can dissolve the insoluble phosphate and potassium) were taken as study objects,microbial incubation and field experiments were conducted to investigate the effect of salt stress on the activity and the phosphate and potassium solubilization of two bacteria,and verify the effects of microbial inoculum application in lightly salinized greenhouse soil. The results showed that the maximum tolerated salt concentration was 10.5% NaCl and the optimum salt concentration of mixed bacteria was 0.5% NaCl,the available P and K concentrations dissolved from minerals were highest in growth medium with 0.5% NaCl and increased by 52.06% and 75.41%. The application of microbial inoculum in the vegetable field with high soil salinization significantly increased the levels of VC and soluble sugar in fruits of tomato,sweet melon,and water melon,and obtained greater yields with increment of 104.81%,23.72%,and 28.96% compared to the control. Moreover,the application of microbial inoculum significantly increased the concentrations of soil available phosphorus and potassium from the fields with tomato,sweet melon,and watermelon by 95.12%,22.83%,134.52%,and 92.71%,6.66%,117.46%,respectively,and significantly increased the number of soil bacteria (P<0.05). In conclusion,microbial inoculum with B. mucilaginosus and B. megaterium can colonize in slightly salinized soil,promote the release of te phosphorus and the potassium in the soil,increase vegetables yields,and improve the quality of vegetable fruits.