Su Jiasan and his son wrote Six Kingdoms, with his father Su Xun as the highest achievement. First of all, we should understand the background of the six-state theory. They lived in the Northern Song Dynasty. This paper puts forward and demonstrates the incisive argument that the collapse of the Six-State Theory is "blaming Qin", criticizes the humiliating policy of the Song Dynasty towards Liao and Xixia, and warns the rulers of the Northern Song Dynasty to learn the lessons of the collapse of the Six-State Theory so as to avoid repeating the same mistakes. In fact, there are many reasons for the demise of the six countries, not just because the land was ceded to Qin. Su Xun did not argue from other aspects, but grasped that the demise of the Six Kingdoms was "the fault of Qin" and served the reality. This is an argumentative paper used to give advice to the rulers of the Northern Song Dynasty. Of course, the author's emphasis will serve his own argument, so it's normal to be somewhat different from history ... I hope I can help you.