In hard pen calligraphy, gold is a special way of writing. Its main feature is that when writing, the starting and closing parts of strokes are thicker and the middle part is thinner, forming a gorgeous texture effect. This kind of writing can make the font look more beautiful and exquisite, and the artistic expression is strong. The application of Jin Shuxin in hard pen calligraphy requires high skills, and it is necessary to master the thickness change and rhythm of strokes.