Abstract: A new method is developed for building a relationship among the viscosity, temperature, curing degree and time to predict the viscosity of the reactive resin system which is affected by the cure degree, temperature and ejective heat of the cure reaction. This method, starting with isothermal viscosity-time curves and isothermal curing degree-time curves, and separates of the curing degree and the temperature effect in the real environment, which were two main factors affecting the reactive resin viscosity. Based on the assumption that the reactive resin system is a partial adiabatic system, the viscosity-time relationship of a reactive resin system under the combined influences of curing degree, temperature and ejective heat of the cure reaction was rebuilt. The viscosity prediction has the high consistency with the test values using the rolling viscometer. The new method can be used to predict the viscosity of the reactive resin system in considering the ejective heat of the cure reaction.