An open incubation method was used.Samples of black soils,collected from different areas(Beian,Hailun,and Gongzhuling) and plots of a long-term fertilization experiment,were incubated aerobically at 20℃ or 30℃,respecfively to study characteristics of organic S mineralization in the soils.Results show that in aerobic incubation,cumulative organic Smineralization increased with the time going on,followed the first-order kinetic model.The cumulative organic S mineralization in the first 4 weeks accounted for 50%~62% of the total mineralization in 14 weeks.The black soil in Gongzhuling was the highest in S supply capacity,and stronger in S supply intensity and quicker in organic S mineralization rate than in Hailun and Beian.The higher the temperature,the higher the mineralization potentiality of organic S,the higher the velocity constant of mineralization reaction,and the shorter the half-life period.In terms mineralization potential of organic S in the long term fertilization experiment,the treatments were in the order of M > MNPK > NPK > CK,showing that organic fertilizer was the major source of soil organic S,and improved soil S supply capacity.