On October 1, 1949, on the rostrum of Tian'anmen, Mao Zedong, as Chairman of CPC Central Committee, Chairman of Military Commission of CPC Central Committee, Chairman of the first National Congress of Chinese People's Political Consultative Conference, and Chairman of the People's Republic of China, proclaimed to the world the founding of Central People's Government of People's Republic of China and hence after Chinese People had been standing up.
In December 1949, Chairman Mao traveled to Moscow to meet with Stalin and signed a treaty of mutual assistance accompanied by economic aid.
On July 31, 1955, Chairman Mao delivered an important speech calling for acceleration in forming agricultural cooperatives. In the winter of 1955-1956, Chairman Mao edited a three-volume compilation of materials on the "Socialist Upsurge" in China's countryside, designed to illustrate the advantages of rapid collectivization. In Spring of 1956, Mao proclaimed the policy of "Letting a hundred flowers bloom" -- that is, the freedom to express many diverse ideas, and hailed the intellectuals and specialists as indispensable to the development of China's economy; and made the celebrated speech of February 27, 1957, "On the Correct Handling of Contradictions among the People". Chairman Mao put into effect in the spring and summer of 1958 in the framework of the "People's Communes" in the Chinese vast countryside.
Mao Zedong served as chairman of the first CPPCC National Committee from 1949 to 1954, and chairman of People's Republic of China until April, 1959, when he was succeeded by Liu Shaoqi.