A novel wide PS plates quality inspection scheme was developed with multi-optical imaging systems linear COD assembling technique. This method can overcome the shortcoming of the conventional linear OOD assembling methods, extend the measuring range of COD and make the system adjust more conveniently. PS plates surface is dived into several segments and imaged on several COD sensor. These COD sensors are driven synchronously and parallel in order to collect data in high speed of 10 m/min. The measurable width of this system reaches 1.2 m,and the resolution can be up to 0.1 mm.