On May 27, 1949, under the leadership of the Party Central Committee, the difficult "Shanghai Campaign" was declared over and Shanghai was liberated. According to the decision of the Party Central Committee, Mayor Chen Yi led Zeng Shan, Pan Hannian and other party, government and military leaders, as well as thousands of cadres trained in Danyang, to take full control of Shanghai, thus starting the journey of the Communist Party of China to lead the construction of an economic megacity. Under the strategic guidance of the Central Committee on various fronts such as war, diplomacy, economy, and finance, and in the coordinated operation of the whole country, Chen Yi and other Shanghai leaders led the broad masses of cadres and the masses to move forward in the difficult situation of intricate and scarce materials. They rushed to the front line to resist typhoon disasters, crushed financial speculation with iron fists, boldly improved production and management methods, strategized to win the "War of Grain and Cotton", resolved the danger of the "Great Bombing", resolved the "April Crisis", repaired the airport for Shanghai's air defense construction, etc., and finally completed the important task of economic construction and large city management entrusted by the Party Central Committee of "the whole country supports Shanghai, and Shanghai supports the whole country".