本文简要分析了现有燃烧稳定性评价方法不具有通用性的原因，然后提出了基于BIBO稳定性理论的新型燃煤钢炉燃烧过程稳定性评价指数CSI，该指数用稳定燃烧过程能够克服的最大燃料扰动率来定量。燃烧过程动态模拟分析和试验测试结果初步验证了CSI指数的有效性。可望在此基础上建立一种全面的评价电站燃煤锅炉燃烧过程相对稳定性的理论体系。 This paper briefly analyzes the reason why the existing combustion stability assessment method is not universal, and then proposes the stability evaluation index (CSI) of the combustion process of a new type coal-fired steel furnace based on the BIBO stability theory, which can be overcome by the steady combustion process Fuel disturbance rate to quantify. The dynamic simulation analysis of the combustion process and the test results verify the validity of the CSI index. Based on this, it is expected to establish a comprehensive theoretical system to evaluate the relative stability of the combustion process of coal-fired utility boilers.