track of Chinese science and technology in 5000 years from ancient times to modern times through detailed historical materials, abundant pictures, simple language and thorough analysis. It systematically introduces the unique exploration made by ancient China in the fields of science such as astronomy, geography, medicine, mathematics, agronomy and natural history, the great contribution made to human civilization in the technical field represented by the four inventions, and the historic leap of Chinese science and technology from lagging behind to running and to leading since modern times. This series can be called a rare set of excellent traditional cultural reading materials especially for children in recent years.