The study carried out By the submerged incubation method and field experiments showed that the mineralization rate could be used as a charade ristic value onitrogen mineralization in paddy soils.The results obtained are summarized as follows:1.Effective accumulated temperature empirical model (Y=K[(T-T₀)D]ⁿ) obtained without deducting the dried soil effect during 12-week incubation period was better than that with deducting the dried soil effect.The empirical model without deducting dried soil effect had a higher precision,and its mineralization parameter K>0 and 0<n<1.2.The mineralization rate Y'(Y'=Kn[(T-T₀)D]^n-1) might be the charade ristic value of nitrogen mineralization.A highly positive correlation existed between the minera.lization rate at effective accumulated temperature of 105℃(Y₁₀₅') and mineralization power,and Y₁₀₅' was closely negatively related to the availability of mineralized N.The amount of IV mineralized during the last 4-weeks incubation period (effective accumulated temperature of 840-1260℃) was determined by Y₈₄₀'.The higher the Y₈₄₀',the more the N was mineralized in the late period.