In view of the problems existing in the traditional design mode of ship interior outfitting, an integrated design mode of ship interior outfitting based on the secondary development of AVEVA Marine (AM) software is proposed. On the basis of completing the initial configuration of integrated design, the secondary development is conducted to realize the effective transmission, sharing, and management of design data of ship interior outfitting from initial design stage, detailed design stage, and production design stage to 3D model stage. Taken the 3D model as the carrier, the seamless connection of detailed design and production design is made to realize the integration of data management, efficient modeling, and one-click drawing. In the actual ship application, the mode can effectively improve the design efficiency and design quality of ship interior outfitting