In February 1951, the Corps entered Korea with all its subordinated divisions as a part of the P eople's Volunteer Army.

During its deployment in Korea, it took part in the Fifth Phase Offensive, during which the corps suffered heavy losses by indirect fire at the riverbank of Imjin River, but made significant territorial gains against the confronting U.S. 24th Infantry Division.

[2] During the First Battle of Maryang San in November 1951, Hill 355, nicknamed Little Gibraltar, was a strategic feature, commanding the terrain for twenty miles around, so the Communists were determined to take it before the truce talks came to an agreement that would lock each side into their present positions.

Hill 355 was held by the 3rd U.S. Infantry Division, who linked up with the Canadian Royal 22nd Regiment on the Americans' western flank.

[3] On November 22, the 64th Army (around 40,000 men) began their attack: over the course of two days, the Americans were pushed back from Hill 355 by elements of the Chinese 190th and 191st Divisions.

[4] A raid led by experienced Canadian non-commissioned officer Léo Major was mounted to relieve the pressure.

[5] In February 1955, as Soviet 39th Army withdrawing from the Port Arthur area, PLA 63rd Corps, with all its three divisions and reinforced by 170th Artillery Regiment from 63rd Corps; Independent Tank Regiment of Huabei Military Region, and 1st Public Security Division, moved into Port Arthur to receive equipment left by the Soviet Army.