Introduction to Guiguzi: At the end of the Spring and Autumn Period and the beginning of the Warring States Period, Guiguzi practiced here and wrote three volumes and 23 chapters of "Guiguzi", which was called the "Book of Heaven" by later generations. He trained and trained four great disciples: Sun Bin, a military strategist, Pang Juan, a general, Su Qin, the prime minister of the six kingdoms, and Zhang Yi, the prime minister of Qin who helped Qin unify the six kingdoms.