2. The main characteristics of bold characters are thick strokes, thin strokes, tight shapes and no arcs. Bold strokes are unified, which is a decorative font, not calligraphy. Bold characters absorb the advantages of strict structure of Song Dynasty in font frame. The horizontal strokes are bold, and the shoulder angles of the Song Dynasty are flattened into equal lines, so that the horizontal and vertical strokes are uniform in thickness, and the Song Dynasty strokes with different tip and head and tail thicknesses are changed into square strokes.