The method of constructing the graphic information system of automatic product line is presented, in which the real time information from sensors is processed and the graphic topological database is generated from a static AutoCAD drawing by recognizing and analyzing the drawing objects which represent the article source, stream line, and control equipments of a product line. In practice, the method has higher proficiency and speed than manual operation, and it will speed up the wider utilization of graphic information system in product lines.