The ship virtual construction technology according to Model Based Definition (MBD) is an innovation of ship design technology. Through selecting the important process links of hull section construction of Liquefied Natural Gas (LNG) ship, based on the unified three-dimensional model, and according to the ship construction process, the virtual simulation verification based on the three-dimensional model is performed before the real ship construction, the manufacturability of ship intermediate products is dynamically analyzed to optimize the process design, the data link of Ship Product Design (SPD) three-dimensional model in the three-dimensional integrity modeling design, virtual simulation, and production is opened up, and the product design, process design and construction simulation technology scheme based on the three-dimensional model is formed, which can effectively reduce the on-site rework rate and improve the efficiency and quality of ship construction.