The countersign column of a graph is usually located in the upper left corner of the graph. The position of the countersign column is usually drawn by the draftsman according to the drawing content and design requirements. Located on one side of the drawing, it will not affect the display of the main contents of the drawing, and it can be signed and sealed conveniently. In the countersignature column, the person in charge of each major needs to fill in the information related to the major, including the name of the major, the name and date of the designer, etc. This information is helpful to record the process of design decision-making, as well as the coordination and communication among various majors.