According to Baidu Encyclopedia, nano pencil is a kind of pencil made of nano technology. Its refill is made of carbon nanotubes or other nano-materials, which has the characteristics of high strength, high conductivity and high precision, and can be used to manufacture micro-devices such as chips, sensors and detectors. The research and development history of nano-pencil can be traced back to 20 12 years, when engineers at MIT developed a special pencil, which can "draw" carbon nanotube circuits directly on the substrate. 20 14 Meng lingchao, a doctoral student at Nanjing university of aeronautics and astronautics, invented a nano pencil that can detect cancer cells and obtained four national patents. 202 1 Mitsubishi Pencil introduced a new type of lead "uni", which made the handwriting clearer and more wear-resistant by inhibiting the diffusion of core powder. Nano pencil is a product to show the application and innovation of nano technology in stationery field. It has broad development prospects and potential market demand.