At the end of the 1980s, a trend of bourgeois liberalization was set off in society. Liberalists propagated bourgeois democracy and freedom and carried out anti-Party and anti-socialist activities. Under this influence, at the beginning of April 1989, young students in some universities in Beijing carried out various forms of activities in response to the problems existing in the real society, forming a learning tide. On April 15, Hu Yaobang, former General Secretary of the Central Committee of the Communist Party of China, died. The masses and young students held various forms of mourning activities. However, few liberalists took advantage of this opportunity to carry out anti-Party and anti-socialist activities under the pretext of mourning. Inspired by them, a large number of students from some universities in the capital and local areas flocked to the streets to hold parades. Some illegal elements in Xi'an, Changsha and other places took the opportunity to beat, smash, rob and burn, and the school tide rapidly developed into turmoil. On April 26, the People's Daily published an editorial entitled "We must fight against the unrest with a clear banner", pointing out that this is a planned conspiracy and a disturbance. Its essence is to negate the leadership of the Party fundamentally and the socialist system. The editorial calls for urgent action and resolute and forceful measures to stop the unrest. However, the situation has not improved. On the evening of May 19, the Central Committee of the Communist Party of China decided to impose martial law in some parts of the capital, but a few rioters incited some people to confront the martial law forces. Meanwhile, serious incidents such as mob attacks on party and government organs and destruction of traffic facilities have occurred in Shanghai and Guangzhou. In response, the Party Central Committee, the State Council and the Central Military Commission took decisive measures to quell the riots.