Upon Hu Yaobang's death, the Tiananmen Square protests of 1989 begin in China.

The Tiananmen Square protests were student-led demonstrations held in Tiananmen Square, Beijing during 1989. In what is known as the Tiananmen Square Massacre (Chinese: ; pinyin: Tin'nmn d tsh) or June Fourth Incident (Chinese: ; pinyin: lis shjin) in Chinese, troops armed with assault rifles and accompanied by tanks fired at the demonstrators and those trying to block the military's advance into Tiananmen Square. The protests started on 15 April and were forcibly suppressed on 4 June when the government declared martial law and sent the People's Liberation Army to occupy parts of central Beijing. Estimates of the death toll vary from several hundred to several thousand, with thousands more wounded. The popular national movement inspired by the Beijing protests is sometimes called the '89 Democracy Movement (Chinese: ; pinyin: Bji mnyn) or the Tiananmen Square Incident (Chinese: ; pinyin: Tin'nmn shjin).

The protests were precipitated by the death of pro-reform Chinese Communist Party (CCP) general secretary Hu Yaobang in April 1989 amid the backdrop of rapid economic development and social change in post-Mao China, reflecting anxieties among the people and political elite about the country's future. The reforms of the 1980s had led to a nascent market economy that benefited some people but seriously disadvantaged others, and the one-party political system also faced a challenge to its legitimacy. Common grievances at the time included inflation, corruption, limited preparedness of graduates for the new economy, and restrictions on political participation. Although they were highly disorganized and their goals varied, the students called for greater accountability, constitutional due process, democracy, freedom of the press, and freedom of speech. At the height of the protests, about one million people assembled in the Square.As the protests developed, the authorities responded with both conciliatory and hardline tactics, exposing deep divisions within the party leadership. By May, a student-led hunger strike galvanized support around the country for the demonstrators, and the protests spread to some 400 cities. Among the CCP's top leadership, Premier Li Peng and Party Elders Li Xiannian and Wang Zhen called for decisive action through violent suppression of the protesters, and ultimately managed to win over Paramount Leader Deng Xiaoping and President Yang Shangkun to their side. On 20 May, the State Council declared martial law. They mobilized as many as ~300,000 troops to Beijing. The troops advanced into central parts of Beijing on the city's major thoroughfares in the early morning hours of 4 June, killing both demonstrators and bystanders in the process. The military operations were under the overall command of General Yang Baibing, half-brother of President Yang Shangkun.The international community, human rights organizations, and political analysts condemned the Chinese government for the massacre. Western countries imposed arms embargoes on China. The Chinese government made widespread arrests of protesters and their supporters, suppressed other protests around China, expelled foreign journalists, strictly controlled coverage of the events in the domestic press, strengthened the police and internal security forces, and demoted or purged officials it deemed sympathetic to the protests. More broadly, the suppression ended the political reforms begun in 1986 and halted the policies of liberalization of the 1980s, which were only partly resumed after Deng Xiaoping's Southern Tour in 1992. Considered a watershed event, reaction to the protests set limits on political expression in China that have lasted up to the present day. Remembering the protests is widely associated with questioning the legitimacy of the CCP and remains one of the most sensitive and most widely censored topics in China.

Hu Yaobang (Chinese: 胡耀邦; pinyin: Hú Yàobāng; 20 November 1915 – 15 April 1989) was a high-ranking official of the People's Republic of China. He held the top office of the Chinese Communist Party (CPC) from 1981 to 1987, first as Chairman from 1981 to 1982, then as General Secretary from 1982 to 1987. Hu joined the CPC in the 1930s, and rose to prominence as a comrade of Deng Xiaoping. During the Cultural Revolution (1966–1976), Hu was purged, recalled and purged again by Mao Zedong.

After Deng rose to power, following the death of Mao Zedong, Hu played a role in the "Boluan Fanzheng" program. Throughout the 1980s, Hu pursued a series of economic and political reforms under the direction of Deng. Hu's political and economic reforms made him the enemy of several powerful Party elders, who opposed free market reforms and Hu's reforms of China's government. When widespread student protests occurred across China in 1987, Hu's political opponents blamed Hu for the disruptions, claiming that Hu's "laxness" and "bourgeois liberalization" had either led to, or worsened, the protests. Hu was forced to resign as Party general secretary in 1987, but was allowed to retain a seat in the Politburo.

Hu's position as Party general secretary was taken by Zhao Ziyang, who continued many of Hu's economic and political reforms. A day after Hu's death in 1989, a small-scale demonstration commemorated him and demanded that the government reassess his legacy. A week later, the day before Hu's funeral, some 100,000 students marched on Tiananmen Square, leading to the 1989 Tiananmen Square protests. Following the 1989 protests, the Chinese government censored the details of Hu's life within mainland China, but it officially rehabilitated his image and lifted its censorship restrictions on the 90th anniversary of Hu's birth, in 2005.