(1) Historically, by the Qing Dynasty, Viet Nam was a vassal state of China, and in a few periods, such as the Yuan Dynasty, it was even directly incorporated into Chinese territory.

(2) Since modern times, both China and Viet Nam have fallen into the dilemma of colonial aggression. Vietnam was invaded by France, Japan and the United States. In modern times, the Qing dynasty lost its status as the sovereign state of Vietnam and was in the same boat.

(3) After the founding of New China, Vietnam just got rid of Japanese colonial occupation, but at this time, France made a comeback and China gave Vietnam selfless assistance. Finally, at the Battle of Dien Bien Phu in 1954, the French were defeated. After that, Americans intervened in Vietnam affairs for the benefit of Southeast Asia, and the war escalated gradually. 1969 to 1975 During the Vietnam War, China once again extended a helping hand to help our socialist brother Vietnam. In the end, Vietnam defeated the American invasion and gained real independence, in which China's help was indispensable.

(4)1979 ——1988 was the period of self-defense counterattack between China and Vietnam, during which the fighting between China and Vietnam was fierce and the relationship was hostile.

⑤ 1989—— At present, the relationship between China and Vietnam has gradually eased, and in recent years, it has been close, with more bilateral economic and trade cooperation and friendly relations.