1947年7月，解放軍變咗做戰略進攻嘅策略。由1948年開始，喺三大戰役完咗之後，國軍損失超過150萬人，亦都冇哂精英部隊，中華民國政府喺中國大陸嘅統治逐漸崩潰。而中國共產黨嘅勢力喺長時間嘅累積底下，加上經過抗日戰爭磨練嘅靈活遊擊戰術優勢完全顯現哂出嚟，開始向全國進攻。去到1950年嗰陣，中共攻入海南島同埋西康，至此中國共產黨控制哂除咗西藏以外中國大陸嘅大部分地區。
In July 1947, the PLA changed its strategy of conducting strategic offensives. Beginning in 1948, after the three major battles, the Nationalist army lost more than 1.5 million men and had no elite troops, and the rule of the Republic of China government in Chinese mainland gradually collapsed. However, the Chinese Communist Party's forces accumulated over a long period of time, coupled with the advantages of flexible guerrilla tactics honed by the War of Resistance Against Japanese Aggression, were fully manifested, and they began to attack the whole country. By 1950, the CCP had invaded Hainan Island and Xikang, and the CCP now controlled most of Chinese mainland except Tibet.