Abstract: This article analyzed the composition of construction drawing elements, and extracted the wall line element information by filtering layers and element types, focused on the classification of overlapping arcs and put forward the methods to deal with them, classified the concentric arcs representing the arc wall, and proposed a method to obtain the center line of the arc wall and the wall thickness. Based on the Revit platform, the article used the C # language for program development, and implemented the automatic generation of the wall, which verified the feasibility of the algorithm, at the same time,improved the efficiency and accuracy of the wall model modeling, and realized the 3D reconstruction of the wall model.