Abstract: On the base of analyzing process data representing and operation properties, the structure of welding structure product hierarchy information Mode/View/Control was built.The expression and operation of model was described.Parameter data of welded joint, master parameters and information of welded joint were integrated.Non-instruct topology information of product-department-joint was described in the model.Structure of model and consistence of operation were analyzed.An example data of product structure tree was showed.Integration method of graphic data between CAD and welding computer aided process planing (WCAPP)based on litmusless meta file was analyzed.The solution of process document based on multi-type template mechanism was offered, which ensure the criterion of dada operation and outputting of process document.