Lu Ban, born in the 13th year of Zhou Dynasty, died in the 25th year of King Ping of Zhou Dynasty, lived in the late Spring and Autumn Period and the early Warring States Period, and was born into a family of artisans for generations. He participated in many civil engineering jobs with his family since childhood, gradually mastered the skills of productive labor and accumulated rich practical experience. Zhang Heng, Pingzi, Han nationality, was born in Xi 'e, Nanyang. He was a great astronomer, mathematician, inventor, geographer, cartographer, writer and scholar in the Eastern Han Dynasty, and made indelible contributions to the development of astronomy, mechanical technology and seismology in China. Ma Jun, a native of Deheng, is one of the most famous mechanical inventors in the history of ancient science and technology in China. When Ma Jun was young, his family was poor, he stuttered, and he was not good at talking but he was skilled in thinking. Later, he became an official in Wei. From 605 to 6 17, the bridge designer Li Chun pioneered the open-shouldered arch bridge with abdominal arch on the main arch map, and he designed the famous Zhao Zhouqiao.