A printing base comprises: a carrying base, an extension base, a vacuum pump and a gas injection valve; the extension base is located at the periphery of the carrying base; the surface of the carrying base has at least one absorbing hole for absorbing the substrate, and the surface of the extension base has at least one injecting hole. By adding a extension base at the periphery of the carrying base, the invention can avoid the provision of test area at the periphery of the display area on the substrate, and increase the area of the display area, and in turn reduce the bezel width of the liquid crystal display panel.