Abstract: By analyzing the actuality of computer aided process planning(CAPP) study,the characters of tabular welding CAPP system were summed up and the system based on Client/Server was developed.The structure of the system was divided into 3 layers,product layer,component layer and card layer.A new planning method was set out that was separating content from format of welding procedure.Both text-based and picture-based cards were managed by saving the outline of the procedure to database.The bidirectional compatibility interface with AutoCAD was created by file format transformation and Object Linkage and Embedded technology.