攻与守形势的变化，直接影响到决策方针。秦朝的统一、兴盛、速亡，在汉初人们的思想上引起了极大的震动，也激发起深刻的思考。从经验教训和历史借鉴来看待这个问题，进而为现实的政治决策提供参考，成为汉初统治集团反复讨论的一个重大问题。秦始皇在完成统一大业后，为巩固 Changes in offensive and defensive situations have a direct impact on policy decisions. The unification, prosperous and rapid death of the Qin Dynasty caused a great shock in the thought of the people in early Han Dynasty, and also inspired profound thinking. Looking at this issue from the experience and lessons learned and from history can provide a reference for realistic political decision-making, and become a major issue repeatedly discussed by the ruling group in early Han Dynasty. Qin Shi Huang completed the unification cause, to consolidate