Abstract: A method of editing default graphic object for man-machine interface installs an editor comprised of a graphic object editor, a graphic object database and a PC screen editor connected to a man-machine interface device, such that users can self define or modify an old graphic object to form a new graphic object as needed by graphic and attribute tool of the graphic object editor, and stores the new graphic object into the graphic object database, and uses the screen editor to obtain the self-defined or modified graphic object from the graphic object database to perform screen editing, and downloads the screen to the man-machine interface for its use and execution.