把握防灾工程的价值及效益规律,是有效指导防灾经济活动和决策的重要前提。本文根据价值工程理论,以及最优化理论及方法,探讨了防灾工程的经济功能、价值及效益规律。提出了描述其规律的防灾增值函数、灾害损失函数、防灾价值函数、防灾成本函数、防灾负担函数、防灾效益函数等数学模型。并给出了一种优选防灾投资项目的评价理论和方法。 Grasping the value and effectiveness of disaster prevention projects is an important prerequisite for effectively guiding economic activities and decision-making in disaster prevention. Based on the theory of value engineering and the theory and method of optimization, this paper discusses the economic function, value and benefit law of disaster prevention project. A mathematical model describing the regularity of disaster prevention and increment value function, disaster loss function, disaster prevention value function, disaster prevention cost function, disaster prevention burden function and disaster prevention benefit function is proposed. And gives a theory and method to evaluate the disaster prevention investment project.