Abstract: Through the study on the model of forecasting forest fire spreading,this research built a multi-model predicting system based on the production rule. The forecasting system,which communicates with the forest fire monitoring system on line,takes unilateralism of the real time data in the traditional formula to the calculation, and the data go back to the input port for feeding back.It formed an amending and complementing system to the database aiming at reducing forecasting errors of the model.Compared with the practical consequences,the forecasting results by this system are believable and the system can fulfil the forecast of forest fire behavior.