本文从地表火蔓延的本质入手，建立了一整套求解地表火行为特征量的数学模型，并运用现代软件编制技术，成功地编制出预测预报地表火行为的计算机软件。该系统能预测复杂地形、气象条件和可燃物分布情形下，火蔓延过程中不同阶段的火行为状况。算例结果表明，系统在预测结果的合理性和准确性等方面优于美国的BEHAVE程序。 This paper starts with the essence of the spread of surface fire and establishes a set of mathematical model to solve the characteristic of surface fire behavior. Using modern software programming technology, the computer software of predicting and forecasting surface fire behavior is successfully prepared. The system can predict the fire behavior at different stages during the fire spread under complex terrain, meteorological conditions and combustible distribution. The results show that the system is better than the BEHAVE program in the United States in terms of the rationality and accuracy of the prediction results.