This study extensively explores the comprehensive optimization methods for the secondary barrier bonding operation in the Mark III membrane-type LNG carrier"s cargo containment system. It entails detailed calculations and analyses of the key factors affecting bonding length that influence work efficiency. The study comprehensively considers several important factors including manpower resource allocation, equipment costs, and bonding quality. The objective is to thoroughly assess the applicability and efficiency of both manual and automated bonding methods in various application scenarios. The methodological framework developed in this study provides engineers with an effective decision-making tool for selecting the most suitable bonding method in practical operations, aiming to enhance work efficiency and quality while balancing cost-effectiveness. The findings of this study not only provide technical guidance for the construction of Mark III-type LNG carriers but also contribute to improving the overall efficiency and safety in the field of LNG carrier construction.