Gezhi Jingyuan is a large-scale compilation work and one of the large encyclopedias of engineering disciplines at that time. The book 100 volume, divided into 30 categories and 886 subheads, collects the records of natural history and technology in ancient books, including astronomy, geography, architecture, vessels, animals and plants, etc. Most quotations are based on the original rare edition, and those who fail to win the bid are also marked, which is enough for assessment. It can be used as a reference for studying the history of ancient science and technology in China.