Capacitance pen is a conductive pen made of conductive material, which is used to touch the capacitive screen and complete the man-machine dialogue operation. Capacitance pen is an auxiliary device that uses conductive materials to imitate human body to complete man-machine conversation. Capacitive touch screen works by current induction of human body. It's a four-layer composite glass screen. The inner surface and interlayer of the glass screen are coated with a layer of ITO (namely coated conductive glass), and the outermost layer is a thin protective layer of Shi Ying glass. ITO coating is used as working surface, four electrodes are led out from four corners, and inner ITO is used as shielding layer to ensure a good working environment.