Aiming at the problem of isolated information of monitoring points and low degree of intelligent decision-making in the current warship fire-fighting system, a node-based fire-fighting system functional logic model was constructed. The intelligent decision algorithm of fire-fighting system damage isolation and reconstruction based on combat damage employment was put forward. And the intelligent monitoring system for fire-fighting was developed. Results of case comparison calculation and system inspection show that the intelligent decision-making algorithm and intelligent monitoring system can effectively improve the speed and accuracy of analysis and decision-making and significantly improve the efficiency of command and control, which provides effective support for the water fire fighting system under combat damage condition.