Abstract ¡§Taiwan Domestic Shipbuilding Industries and Warship Commercial Maintenance¡¨ is the long-term policy of defense independent industries pushed by the Taiwan government. Domestic shipbuilding, ship maintenance, and national integrated resources can be used to support naval ships logistic maintenance. But there are some differences in technology and concept between ¡§merchant ship¡¨ and ¡§warship¡¨. The complexity, mobility, and specialization of warship systems are higher than merchant ships. Every type of operating system now utilized by commercial shipyards must be modified if they want to receive and carry on warship commercial maintenance activity. Building desirable systems to conduct warship maintenance project management effectively is the key factor if commercial shipyards wish to carry on warship commercial maintenance activity. How to evaluate a warship commercial maintenance system and provide improved solutions for commercial shipyards is the main purpose of this research. This paper start from warship maintenance project management and focuses on warship commercial maintenance peculiarities to correct domestic public projects and shipbuilding related references. We use the Habitual Domains (HD) method to search Key Success Factors (KSF) for warships commercial maintenance system applied to commercial shipyards and to adopt Analytic Hierarchy Process (AHP) to exploit a multi-estimate criteria model to enhance effectiveness and reliability for evaluating a warship commercial maintenance system. The present study uses theoretical and actual experiences to develop a warship commercial maintenance system. Several recommendations are made in order to improve overall performance of a warship commercial maintenance system. We hope that domestic commercial shipyards can do the long-term planning and investment on conducting warship commercial maintenance activity. The navy also can perform warship maintenance frugally and diversely. In this way, navy and commercial shipyards can cooperate and realize the optimal benefit from both sides. ¡iKey Words¡j Taiwan Domestic Shipbuilding Industries, Warship Commercial Maintenance, warship maintenance project management, Habitual Domains (HD), Key Success Factor (KSF), Analytic Hierarchy Process (AHP)