Su Qin (? Ji zi, born in Luoyang (now Luoyang, Henan Province), was a famous strategist, diplomat and strategist during the Warring States Period. 1 Su Qin studied under Guiguzi, traveled for many years after writing a book, and returned down and out. Then he studied hard on Yin Fu. A year later, he lobbied other countries, which was appreciated by Yan Wengong and sent to Zhao. After Su Qin arrived in Zhao State, he put forward the strategic idea of uniting six countries to resist Qin State, and finally formed a joint alliance. As a "long-term partner", he attached great importance to the six countries, so that Qin State dared not go out of the valley for fifteen years. After the dissolution of the alliance, the State of Qi attacked Yan, and Su Qin said that the State of Qi returned to Yan. After Yan arrived in Qi State, he engaged in anti-espionage activities and was appointed as a guest of Qi State. The doctor of Qi sent someone to assassinate him because of his rivalry for favor. Su Qin gave advice and killed the assassin before he died. Perilla 3 1 piece of Hanshu Yiwenzhi was lost earlier. There are 16 essays and letters in the silk book Letters of the Warring States, among which 1 1 is not found in the existing ancient books handed down from generation to generation. (Overview of Su Qin's head Source: Qing Guangxu's Su Family Tree in Chengjiang, Jiangsu 3)