Starting from the standard interface data files required for the reconstruction of KCONG software model, the problems of welding module development, welding foot height setting, and datum plane selection of SPD software are expounded. Through the non-interference components screening, and the development and flow optimization of SPD software welding drawings, the drawing problem of sub-assembly robot in practical application and construction is solved, so that the intelligent manufacturing technology based on the SPD software can be successfully applied in the ship enterprises of our country.