According to the Model Based Definition (MBD) technology, the definition and annotation methods of ship data set are studied. The MBD technology and MBD data set are introduced, and the definition method of ship MBD data set for hull specialized line and outfitting specialized line and the annotation method of ship MBD data set are proposed, which can provide reference for the shipbuilding enterprises to improve the level of ship production and design by the MBD technology.