This research is to scan the defect of large LCD panel and accelerate the flow pattern. The flow patterns like U、V、T、I shapes can accelerate large LCD panel scan velocity. Therefore this conveyer belt using U shape, panels entering the conveyer belt step by step, it can avoid waiting time while defects detect on measure device route. Panel scan one side then changes direction and continued forward along the route on the conveyer belt, measure the other side of panel. The other group of panels can scan continuously one by one and transport to the other segment on conveyer belt.