In view of the traditional data processing method for profile drawing and the shortage of earthworkcalculations, the data processing algorithm of between and among the acceptance ground line, the design groundline, the original ground line between was proposed, and the LISP was utilized for the secondary development ofCAD. Operating results of engineering examples show that, this the whole route of the original floor, the automaticprocessing and drawing of original design, actual ground line, three line profile and the calculation of actual earthand overcut and undercut earthwork quantity were...