The amount of organic nitrogen mineralization increased but the increasing speed descended with incubation time in aerobic condition, and their relationship followed chemical first-order reaction equation. The order of nitrogen mineralization potential of different treatments was: Organic manure (403.55 mg/kg) >Straw returning back to field (365.36 mg/kg) > Chemical fertilizers (335.25 mg/kg) > No-tillage (328.05 mg/kg) > Deep harrowing (324.74 mg/kg) > CK (268.65 mg/kg), and no significant difference was found among the three tillage ways. The half-time of the organic nitrogen mineralization related with fertilization, and the half-life of the organic manure treatment was longest, 4.12 weeks longer than CK's (the shortest). No significant difference in mineralization rate constant was found among all treatments.