We found that the production of Chinese knot is very simple. It forms a beautiful pattern through the winding of lines, and the strength is very high. Therefore, when designing this pen holder, we used the Chinese knot production process for reference, and used iron wire to imitate the material of the Chinese knot, and increased the structural strength by winding it. The iron wire loops around in the space and clamps the pen body of the pen, so that the iron wire becomes the pen holder of the pen. This kind of craft is very simple, but the visual effect is very good, and the cost is very low, which is the wisdom of Eastern traditional culture