Abstract: The corn stalks were returned to the field by nylon mesh bag embedding method to study the degradation rate of corn stalks and soil nutrient release characteristics. The effects of corn stalks on corn yield and quality characteristics were analyzed to optimize the utilization of corn stalk degrading bacteria, in order to provide technical support for the rational utilization of corn stalk resources and the application of microbial agents, the results showed that the degradation rate of corn stalk with stalk degrading bacteria was significantly higher than that without stalk degrading bacteria. Soil nutrients in difterent periods showed a trend of first increase and then decrease. The nutrient release was the highest in the soils treated with stalk degrading composite bacteria GF-20, and the degradation rate of soil available nitrogen, soil available potassium, soil available phosphorus, soil organic matter was higher than that of the control. They increased by 21.39 mg/kg, 62.82 mg/kg, 6.86 mg/kg, 4.41 g/kg in 30 days, respectively, and reached significant difterenee. The number of grain and 1000 grain weight of corn treated with stalk degrading bacteria GF-20 were significantly improved, were increased by 16.36% and 3.16% compared to no bacterial treatment, respectively. The application of straw degrading bacteria corn grain protein and starch content was significantly higher than that of straw not returning to the field, which could improve yield and quality of corn to some extent.