Bi Sheng, northern song dynasty cloth. Yingshan county, Hubei Province, died in February of the Northern Song Dynasty. In the early Song Dynasty, I carved books for my boss. During the Song and Qing Dynasties (1041-1048), he invented movable type printing technology based on his own practical experience, that is, engraving words on a clay tablet, printing one word at a time, and hardening with fire to form movable type. Bi Sheng died before this technology was popularized. His words were collected by Shen Kuo's family, and his deeds can be found in Shen Kuo's Meng Qian Bi Tan. Movable type printing has many advantages, such as multi-purpose, repeated use, fast printing speed, saving time and labor, and saving materials. It is more economical and convenient than full-page lettering. It is a qualitative leap in the history of printing technology and has a great and far-reaching impact on the printing progress of later generations and even the world civilization. It is called one of four great inventions of ancient china. Bi Sheng's tombstone was found in 1990 yingshan county, Hubei province.