The full name of Sikuquanshu is Qin Ding Sikuquanshu, which is a large-scale series compiled during the Qianlong period of Qing Dynasty. It took thirteen years to compile, and it was divided into four parts: classics, history, volumes and collections, hence the name "Four Kus". It is the largest cultural project in ancient China. It makes the most systematic and comprehensive summary of China's classical culture and presents the knowledge system of China's classical culture. China's literature, history, philosophy, science, engineering, agriculture, medicine, almost all disciplines can find the source and blood.