Why did China withdraw from the Sino-Indian War?

Because China took the initiative to cease fire in order to promote the peaceful settlement of the Sino-Indian border issue.

1A declassified file in June, 963 mentioned that China took the initiative to cease fire and retreat. The file reads: "In order to strive for a peaceful settlement of the Sino-Indian border issue, the Chinese border guards not only took the initiative to cease fire and retreat, but also took the initiative to return the military materials seized in the battle to the Indian side.

1962 12 14 and 16, the Indian government informed the Indian government in two notes that the Indian side indicated that the border issue between China and India should be resolved by peaceful means, and hoped that the border conflict between China and India would not happen again ... Sending military supplies to India was one of many friendly steps taken by the China government to strive for a peaceful settlement of the border issue between China and India. "

Extended data:

Historical causes of the Sino-Indian War;

First of all, Britain has planted the bane of the Sino-Indian border dispute.

China and India have long-term exchanges and traditional friendship in history. The maps of the two countries are marked with boundaries according to the traditional custom line, and the people of the two countries jointly abide by this traditional custom line.

However, after Britain ruled India, the British and Indian authorities pointed the finger of aggression and expansion at the southwestern and northwestern border areas of China. The British and Indian governments arbitrarily demarcated the so-called "McMahon Line" on the grounds that the Sino-Indian border had never been formally demarcated, and carried out aggression and expansion activities in China, Tibet, Xinjiang and other places, laying the bane of Sino-Indian disputes.

Second, the China administration made concessions in the negotiations.

The China administration has never recognized the McMahon Line or the Johnson Line. Sikkim kingdom was annexed by India in 1975. Sikkim is regarded as a state of India, and the Natura port at the foot of the Himalayas is designated as the border defense and customs inspection pass. In the Sino-Indian border negotiation agreement, China indirectly recognized India's sovereignty over Sikkim and made major concessions to resolve the border dispute.

Baidu Encyclopedia-Sino-Indian War

People's Daily Online-Deciphering the Sino-Indian War: Why did China voluntarily withdraw its troops after winning?