1969, the Treasure Island incident occurred between China and the Soviet Union, and Lin Biao issued the "Order 1", making the northeast the front line against the Soviet Union. According to the instructions of the "Military Commission Office Group" established by Lin Biao, the National Defense Science and Technology Commission ordered the "Harbin Military Industry" to go south.
1970, Harbin Military Missile Engineering Department, Electronic Engineering Department and Computer Engineering Department moved to Changsha and established Changsha Institute of Technology (now National University of Defense Technology). The Department of Atomic Engineering of Harbin Institute of Technology merged with Harbin Institute of Technology, which belongs to the Second Machinery Department of the Commission of Science, Technology and Industry for National Defense, and moved to Chongqing to form Chongqing University of Technology (later revoked, Harbin Institute of Technology moved back to Harbin); The Air Force Engineering Department moved to Xi 'an, merged with Northwestern Polytechnical University, and formed a new Northwestern Polytechnical University, which belongs to the Third Machinery Department of the National Defense Science and Technology Commission. Originally, the Department of Naval Engineering moved to Wuhan. Later, due to various reasons, the Department of Naval Engineering stayed in Harbin and established Harbin Institute of Ship Engineering (now Harbin Engineering University).
In addition, as early as 1960 and 196 1, Harbin military industry was divided into "Artillery Engineering College" (now Nanjing University of Science and Technology), "Engineer Engineering College", "Armored Forces Engineering College" and "Chemical Defense Command Engineering College".