In order to get rid of the shortcomings of the current 2D work guidance method in the shipyard workshop, 3D work guidance technology for hull assembly based on MBD is researched. First, based on the definition of MBD technology, the classification, organizational structure and overall application framework of block MBD data sets are proposed; the contents of the D-MBD model and P-MBD model are summarized. Secondly, based on the P- MBD model, the process of block virtual assembly simulation and expression forms of simulation craft model are proposed. Finally, the MBD model is lightened based on VRML technology; and 3D construction guidance software is developed.