According to the given 2D orthographic views to image the object’s shape is one of the key qualities that engineers and technician must possess. This paper presents a teaching approach with which the teacher can easily, effectively and efficiently teach students how to solve the problems that the object’s shape is required to be imaged and the third view is required to be drawn according to the two given 2D orthographic views. The approach emphasizes integrated and flexible application of Boolean’s set operation of AutoCAD software and basic knowledge of engineering drawing with no needs for complicated computation and 3D rich imagination. It is intended to encourage student’s interest and enthusiasm in creative design using CAD software. And teaching practice has shown this method can improve greatly student’s quality of creative spatial thinking and computer-operating.