During the Warring States Period, one of the schools mainly engaged in political and diplomatic activities was a hundred schools, with its founder Gui Guzi and outstanding representatives: Sun Bin, Pang Juan, Su Qin and Zhang Yi, and The History of Han Literature and Art was listed as one of the "Nine Streams". "everything is done wrong" said: "vertically, the United States attacks the strong with the weak; If you are horizontal, you will be weak if you are strong. " They are unpredictable and capricious, and their plans are based on subjective political requirements. The main representative of Zonghe School is Su Qin, and the main representative of Lian Heng School is Zhang Yi. Su Qin is Zhao Zhixiang, "United against Qin", and is also the seal of the six countries. However, the good times did not last long, and its "alliance" collapsed immediately. Su Qin died in the capital punishment of King Qi Min's car crack. Yi cheung got Su Qin's "support" and became a doctor of Qin. When Su Qin died, he immediately implemented his "Lian Heng" technique, which made Su Qin's alliance disappear. It also laid a theoretical foundation for Qin to finally unify the whole country.