1949 presided over founding ceremony.

10 6, People's Republic of China (PRC) was founded, and he was elected as the chairman of the Central People's Government. 1June, 950, presided over the Third Plenary Session of the Seventh Central Committee of the Communist Party of China, and put forward the general task of striving for the basic improvement of the country's financial and economic situation. In June+10 of the same year, forced by the invasion of the Democratic People's Republic of Korea by the US military and threatening the situation in northeast China, the Central Committee of the Communist Party of China led by him decided to launch the War to Resist US Aggression and Aid Korea. 1950 to 1952, under his leadership, he carried out democratic reforms such as land reform and suppression of counter-revolution, launched the "three evils" movement against corruption, waste and bureaucracy, and the "five evils" movement against bribery, tax evasion, theft of state property, Jerry-building and theft of economic information. 1953, according to his suggestion, the Central Committee of the Communist Party of China announced the party's general line in the transitional period and began to systematically carry out socialist industrialization and socialist transformation of private ownership of the means of production. 1954, the first session of the first national people's congress adopted the constitution of People's Republic of China (PRC) drafted by him. At this meeting, he was elected as the first chairman of the People's Republic of China (PRC) (PRC) until 1959.