Corn seed of ’Xuanfeng 2’ was taken as material.The effects of soaking seeds with different concentrations of photosynthetic bacteria（PSB） on germination,seedling height,chlorophyll and soluble sugar content had been studied.Meanwhile,the influence of different concentrations of PSB application and different spraying times on seedling height,chlorophyll and soluble sugar content also had been studied.The results indicated that PSB soaking could promote the germination and growth of corn,and increase chlorophyll and soluble sugar content.The most suitable soaking concentration of PSB was 10-fold dilution（p＜0.01）.Spraying PSB could increase corn seedling height,chlorophyll and soluble sugar content.The most suitable spraying concentration of PSB was 30-fold dilution（p＜0.01）.