Lang Son Foreign Affairs Office was established according to Resolution No. 33/2004 / NQHĐNDKXIV dated 16/12/2004 by the People's Council of Lang Son province. On 15 May 2005, the People's Committee of Lang Son Province issued Decision No. 563 / QD-UB dated 14 April 2005 regulating functions, The Department of Foreign Affairs of Lang Son province. In 2006, the provincial People's Committee officially issued the Decision No. 400 / QD-UBND dated 17 April 2006 regulating the functions, tasks, powers and organizational structure of the External Relations Department of Lang Son province.