The government has never released a death toll for the crackdown, but estimates from human rights groups and witnesses range from several hundred to several thousand.
"The Chinese government long ago reached a conclusion about the political turmoil at the end of the 1980s," Foreign Ministry spokesman Hong Lei told a daily news briefing.
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"In the last three decades and more of reform and opening up, China's enormous achievements in social and economic development have received worldwide attention. The building of democracy and the rule of law have continued to be perfected," he said.
"It can be said that the road to socialism with Chinese characteristics which we follow today accords with China's national condition and the basic interests of the vast majority of China's people, which is the aspiration of all China's people."
The foreign ministry is typically the only government department which will regularly answer questions from foreign reporters, especially on sensitive topics.
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The run-up to the anniversary has been marked by detentions, increased security in Beijing and tighter controls on the Internet, including disruption of Google services.
Hong would not comment on why Google was being targeted, saying only that the government "manages the Internet in accordance with the law."
Authorities detained several activists last month after attending a meeting about the protests, including prominent rights lawyer Pu Zhiqiang, prompting concern in the United States and Europe.
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