April 4, 1955: The 5th Plenary Meeting of the 7th CPC Central Committee is held

April 4—May 11, 1947: The fourth group of troops in the Shanxi-Hebei-Shandong-Henan Military Zone stages a successful counter-offensive in southern Shanxi to crush the forces of Hu Zongnan and Yan Xishan

April 4, 1955: The Fifth Plenary Meeting of the Seventh CPC Central Committee is held

April 4, 1990: The Third Session of the Seventh National People's Congress adopts the "Basic Law of the People's Republic of China on the Hong Kong Special Administration Region"