"Mr. Xu Zijiu is one of the most outstanding calligraphers in contemporary China and is recognized as the most powerful calligrapher in today's book world." This is perhaps the most appropriate evaluation of Mr. Xu Zijiu. Xu Zijiu studied under the famous calligraphy master Sha Menghai, and his calligraphy style is based on the solid center skills of the two kings, especially the changes of Zhang Ruitu's flank, which gives people a sense of beauty. Xu Zi said long ago: "Calligraphy is the knowledge of human beings, and the art of calligraphy is the expression of calligrapher's philosophical consciousness and experience. The highest realm of pen and ink application is really like the realm of great wisdom in life. It's not flattering others, but being beautiful is wonderful, similar to having a loud voice. "