1945 10 In October, Chiang Kai-shek violated the October 10th agreement and sent troops to attack the liberated areas on a large scale, which was opposed by the people. 1 1 month 19, representatives from all walks of life in Chongqing formed an anti-civil war federation, calling on the people of the whole country to mobilize and stop the civil war by all means. On the 25th, more than 6,000 Kunming students held an anti-civil war news party, which was harassed and destroyed by the Kuomintang military and police. The next day, all the school students went on strike. 1 February1day, Kunming Kuomintang authorities dispatched a large number of military and police to slaughter and beat the teachers and students who went on strike, resulting in four deaths and more than 20 injuries, creating a "121"tragedy that shocked the whole country. After the incident, Kunming students went on strike for one month and received wide support from the whole country. An anti-civil war movement dominated by the student movement swept the entire Kuomintang-ruled area.

Like many famous student movements in history, the December 21 Movement is not an isolated social phenomenon, but reflects the will and demands of the broad masses of the people. The 12 1 tragedy created by the Kuomintang reactionaries educated the masses with bloody facts and pushed many students, teachers and people in society to the road of resolute struggle. The "December 11th Movement" was the first movement of the people in the Kuomintang-controlled areas for peace and democracy, which effectively attacked and isolated the reactionaries and promoted the development of the democratic movement in the Kuomintang-controlled areas.