Nutrient release rate is the key to quality determination and evaluation of slow/controlled-release fertilizers. Nutrient release characteristics of five slow/controlled-release fertilizers were evaluated according to the industry standard of slow/controlled-release fertilizer (HG/T 3931-2007) and the standard recommended by the Committee of European Normalization (CEN) using water extraction method and soil incubation method. Nutrition release was accelerated when temperature of the solution in the water extraction method was raised from 25℃ to 100℃. The regression equation for prediction and forecast of the 100℃ fast extraction method fit a quadric equation in one variable with a correlative coefficient being >0.98, and could be used to quickly and precisely predict release duration of slow/controlled fertilizers. The difference between the measured value and predicted one was only one to three days. Besides, electric conductivity measurement could also be used to quickly and precisely predict nutrient release rate and duration. By using the electric conductivity measurement at 100℃, the release duration of CRF2 and CRF3 was predicted to be 65days and 81days, less than 3.5% in difference from their measured duration of 66 days and 84. Parameters, like initial nutrient release rate, mean release rate, and release duration, could be used for integrative evaluation of slow/controlled-release fertilizers.