[citation needed] After the victory of the Second Sino-Japanese War in late 1945, and according to the treaty of Zhongqing, Zhejing MD's military forces were ordered to moved north into Shandong province and joined the newly formed Shandong Field Army as its 1st Column with Ye Fei and its commander and Lai Chuanzhu as the political commissar.

The 1st Column became the main fighting formation of the Huadong Field Army and took parts in epic battles such as Mengling, Yu Wan Su, and Huaihai.

[citation needed] After the Civil War, the 20th was stationed in the Jiangsu and Zhejiang areas and prepared for the invasion of Taiwan as a reserve formation.

[citation needed] After the Korean War broke out, the 20th Army entered Korea in November 1950 as part of the Chinese People's Volunteers, and returned to China in October 1952.

[citation needed] In May 1989, the 20th Army's 58th and 128th Infantry Divisions were deployed to Beijing to enforce martial law and suppress the Tiananmen Square protests of 1989.

[citation needed] The formation remains active as part of the Jinan Military Region,[5] as one of the new "all brigade" Group Armies.