Hand-drawn sketching is a necessary part of the design process, and is widely used in the initial design stage, brainstorming, research stage and concept exploration, as well as design presentation work. Drawing is a powerful tool to convey concepts to peer designers, engineers or model makers, even customers, contractors and public agencies. In this course, through the use of stylus pens and simple tools to quickly conceive design ideas, from geometric figures to perspective drawing methods, let students learn the drawing techniques of expressing products.