Predicting inorganic nitrogen release rate and curve from control-release nitrogen fertilizers (CRFs) is important in instructing how to apply the fertilizers to meet the balances optimal plant nutrition with minimal environmental impact. It takes a long time to measure nitrogen release curve from CRFs by the traditional methods. The release rate of control release nitrogen fertilize can be accelerated in the short time under high temperature incubation. We hope to build a relationship between high temperature and constant temperature for nitrogen release curve from CRFs. Further it will be possible to predict nitrogen release curve in constant temperature by using the nitrogen release curve under high temperature incubation in a short time. We test the release rate in several CRFs which were from Japan, USA and China during 1,3,5,7,10,24,30,36,48,54,60,72h et al by laboratory incubation experiments under 100 ⁰C temperature. We establish a nitrogen release model for multi-cote CRFs. The result of incubation study will provide the predication of nitrogen release rate from CRFs under constant temperature. It need to do more research work for applying the quick test of nitrogen release rate in CRFs company to know nutrients release curve of CRFs in short time.