Mineralization of organic sulfur in four soils (Black soil, Cinnamon soil, Yellow brown earth and Red soil) was studied by means of an open-incubation system at 20℃ and 30℃ in aerobic and waterlogging conditions, separately. Results showed that the amount of S mineralized at 30℃ was significantly greater than at 20℃ (P<0.01), and also greater amounts of S were mineralized in the aerobic condition than in the waterlogging condition in black soil, cinnamon soil, yellow brown earth and red soil. Cumulative amount of S mineralized and the percentage as soil organic S of the four soils incubated in the aerobic condition at 20℃ and 30℃ was 17.53-24.35mg kg^-1 and 34.20-54.33mg kg^-1,2.5%-6.5% and 5.0%-14.5%, respectively, and in the waterlogging condition at 20℃ and 30℃ 18.14-21.15 mg kg^-1 and 26.86-30.63 mg kg^-1,2.6%-5.6% and 4.0%-7.7%, respectively. The ratio of the amount of S mineralized at 30℃ to that at 20℃ was 1.85-2.23 and from 1.28-1.71 in aerobic and waterlogging condition, respectively.