Based on the Aveva Marine design platform, this paper proposes an integrated design approach for ship interior outfitting. By utilizing .Net and PML secondary development techniques, a corresponding integrated interior outfitting design system is developed to facilitate data transfer, sharing, and management throughout the stages of preliminary design, detailed design, and production design. With the three-dimensional model as the carrier, seamless integration is achieved between detailed design and production design, enabling data management, efficient modeling, and one-click drawing generation within the integrated interior outfitting design and construction mode. The system has been applied in practical projects, effectively improving the efficiency and quality of ship interior outfitting design.