The truly recognizable and mature ancient Chinese characters are Oracle Bone Inscriptions in Shang Dynasty, from Oracle Bone Inscriptions to Qin Xiaozhuan era is the ancient Chinese characters era, and from Han Li to Weibei is the Chinese characters development era. By the maturity and wide application of Tang Kai, the standardized use of Chinese characters reached its peak, and by the appearance of movable type printing and Song style in Song Dynasty, the writing and printing of Chinese characters were two-way.