Based on the characteristics of cost-benefit of disaster resistant engineering, the concept of cost-benefit function of disaster resistant engineering is given and its characteristics are analyzed. According to different decision-making principles, the cost-benefit analysis models are worked out. It offers a useful tool for cost-benefit analysis and decision making of investment in disaster resistant engineering. Based on the characteristics of cost-benefit of disaster resistant engineering, the concept of cost-benefit function of disaster resistant engineering is given and its characteristics are analyzed. According to different decision-making principles, the cost-benefit analysis models are worked out. It offers a useful tool for cost-benefit analysis and decision making of investment in disaster resistant engineering.