Screen printing refers to the use of silk screen as a plate base, and through the photosensitive plate making method, made into a screen printing plate with graphics and text. Screen printing is composed of five elements, screen printing plate, squeegee, ink, printing table and substrate. Use the basic principle that the mesh of the graphic part of the screen printing plate can penetrate the ink, and the mesh of the non-graphic part cannot penetrate the ink for printing. When printing, pour ink on one end of the screen printing plate, use a squeegee to apply a certain pressure to the ink part on the screen printing plate, and at the same time move to the other end of the screen printing plate at a uniform speed, the ink is moved by the squeegee from the graphic Part of the mesh is squeezed onto the substrate.