Abstract: Using nylon net to simulate stalk return to soil, the decomposition rate and nutrient release of organic C, N, P and K of corn stalk treated with different decomposition maturing agents were studied. The results showed that: (1) the decomposition rate of corn stalk was: fast decomposition period (first 10 days)>medium decomposition period (10-50 days)>slow decomposition period (50-100 days); after 100 days, 72.46%-76.09% of the corn stalk biomass was decomposed; the accumulated decomposition rate under decomposition maturing agent was higher than that of CK; (2) the sequence of nutrient release rate of corn stalk was: K>P>C>N, after 100 days, the average nutrient release rate of organic C, N, P and K of corn stalk was 58.66%, 57.3%, 88.68% and 94.88%, respectively; the decomposition maturing agent was beneficial to difficult destructive materials in corn stalk and could accelerate nutrient release of organic C, N and P. It was demonstrated that zymogeneous bacteria of organic waste had the best effect and could be promoted in production.