Guan Zhong's greatest contribution in his life was to carry out some new policies aimed at "supporting with money" and carry out comprehensive reforms in economy, military and diplomacy, so that Qi became an economic and military power in a short time. Also let Qi Huangong qualified to call the shots. Guan Zhong's reform can be said to have laid a solid foundation for the strength of Qi and the hegemony of Qi Huangong. Le Yi. At the end of the Warring States period, an outstanding strategist assisted Yan Zhaowang in revitalizing the Yan State and retaliated against the powerful arrogance of the Yan State.