the end of June 1946 , Chiang Kai-shek despite aspiration of people throughout the peaceful nation-building , brazenly tearing up the Armistice Agreement and the CPPCC resolutions , launched a full- Liberated Area attack. Liberated Areas, military and civilian leadership of the Communist Party of China heroic self-defense, the beginning of a great people's liberation war . From June 1946 to June 1947 , the People's Liberation Army in the strategic defensive stage of the war in the liberated areas . With Mao Zedong as the core of the CPC Central Committee in order to concentrate superior forces before and after the smash , to destroy the enemy 's military policy of the KMT's all-out offensive and key offensive . Liu and Deng strong crossed the Yellow River from advancing to the Dabie Mountains in July 1947 , the People's Liberation Army from strategic defense to strategic offensive . In August and September , the Shanxi-Hebei-Shandong-Henan Field Army led by Chen Geng, Hsieh Fu-chih Chen Yi , Su Yu, East China Field Army led by the main have also mastered Nanzheng . Liu and Deng , Chen Su , Chen Xie Lu army and twin battle commence at the Central Plains , the war to the Kuomintang areas , a large number on the outside and destroy the enemy , a rapid change in the contrast of the enemy force . From September 1948 to January 1949 , the PLA has carried out the Liaoshen, Huaihai , and Beiping-Tianjin three battles , and basically wiped out the main army of the Kuomintang , the liberation of the region north of the Yangtze River . Chiang Kai-shek was forced to step down in early 1949 , to retire behind the scenes , and continue to demand peace talks by the acting president of Li Tsung-jen . In March 1949 , the CPC Central Committee held a seventh two plenary session , formulated the basic policy of the party made ​​the national victory and beyond . April 21 , the last KMT refused to sign the domestic Peace Agreement , Mao Zedong , Zhu De issued the marching orders to the nation . People's Liberation Army millions of bold warriors , force a crossing of the Yangtze natural moat , 23, the liberation of Nanjing , declared the destruction of the KMT 20 years of rule . People's Liberation Army (PLA) follow up a victory to sweep the leaves to autumn potential strategic pursuit of the Kuomintang army . ... In September in 1949 , the first plenary session of the Chinese People's Political Consultative Conference (CPPCC) was held in Peking , and elected the Central People's Government . October 1 , the founding of the People's Republic of China . ...