One Country, Two Systems
One Country, Two Systems is China's formula for governing Hong Kong and Macau under their own legal and economic systems while under Chinese sovereignty.
One Country, Two Systems is a formula that China's leader Deng Xiaoping proposed in the early 1980s to bring territories back under Chinese sovereignty without replacing their economic and legal systems. Under the deal, sovereignty and defense would belong to Beijing. Everything else, including capitalism, courts, currency, and press freedom, would remain unchanged for fifty years. Deng designed the formula for Taiwan, but it was first agreed for Hong Kong, in a treaty with Britain signed in 1984, and later extended to Macau. Hong Kong was supposed to prove that the arrangement worked, making it easier to persuade Taiwan to accept it voluntarily. Instead, Beijing dismantled the arrangement in Hong Kong from 2020, and the vast majority of people in Taiwan now reject the formula entirely.
How Deng Xiaoping struck the deal over Hong Kong
Deng proposed One Country, Two Systems to solve a problem that China could not settle by force: how to take back regions that had operated for decades under completely different legal and economic systems. The formula was meant for Taiwan, but Hong Kong came first because of a deadline.
Britain had held Hong Kong Island since 1842, when China ceded it after the First Opium War. But the New Territories, which made up most of the colony's land and water supply, were on a 99-year lease expiring in 1997. Hong Kong could not function without them.
Britain's prime minister, Margaret Thatcher, tried to trade recognition of Chinese sovereignty for continued British administration of Hong Kong. Deng refused outright. He told Thatcher that China could simply walk in and take the territory if it chose to.
The two governments signed the Sino-British Joint Declaration on December 19, 1984, and registered it with the United Nations. Under the agreement, Hong Kong would return to China on July 1, 1997, as a Special Administrative Region. China then wrote the Basic Law, adopted in 1990, which served as Hong Kong's mini-constitution. It created a separate legislature, courts that could hear cases up to final appeal within Hong Kong, and guarantees of free speech and assembly. The Basic Law also promised that the chief executive and the legislature would eventually be chosen by universal suffrage, but it set no date and no mechanism. Macau was returned to China on similar terms in 1999.
How the arrangement collapsed in Hong Kong
For roughly fifteen years after the 1997 handover, the arrangement mostly worked. The territory's courts, press, and annual protest marches all continued. Hong Kong also served as the main route for foreign investment into mainland China, and that economic role gave Beijing a practical reason to leave it alone.
Two problems were built into the formula from the beginning. One was that universal suffrage was promised without a date or a way to deliver it. Every attempt to move toward open elections produced confrontation. In 2014, Beijing announced that only candidates vetted by a pro-Beijing committee could run for chief executive. Tens of thousands of protesters occupied major roads for 79 days in what became known as the Umbrella Movement.
The second problem was that Deng's formula assumed the gap between Hong Kong and the mainland would narrow as mainland China's economy caught up. The opposite happened. A separate Hong Kong identity grew stronger, especially among young people, at the same time that China's political system was tightening under Xi Jinping.
The turning point arrived in 2019, when a bill that would have allowed extradition to the mainland triggered protests on a scale Hong Kong had never seen. Organizers estimated that up to two million people marched on June 16, more than a quarter of the city's population. Over the following six months, the protests turned into running clashes between demonstrators and police. The government withdrew the bill but could not restore order.
On June 30, 2020, China's central government passed a National Security Law and applied it to Hong Kong without going through the local legislature. The law made it a crime to pursue secession, subversion, or terrorist activity, or to work with foreign governments against China. It also let mainland security agencies operate in the territory for the first time. In 2021, the electoral system was rewritten so that only candidates approved as "patriots" could stand. The city's largest pro-democracy newspaper, Apple Daily, was shut down after police froze its accounts and arrested its editors. Forty-five former legislators and activists were convicted of subversion in the largest national security case and sentenced to up to ten years in prison. In March 2024, Hong Kong passed a local security law under Article 23 of the Basic Law. The legislature voted unanimously, eleven days after the bill was introduced. The territory had resisted the legislation for over two decades.
Does One Country, Two Systems still apply in Hong Kong?
The Basic Law remains in force, and Hong Kong still uses its own currency, runs its own courts, and operates a separate customs territory. But the freedoms the formula was designed to protect, including an independent press, contested elections, and the right to political opposition, no longer exist in practice. Britain and several other governments have declared that China breached the Sino-British Joint Declaration. Beijing's position is that the Joint Declaration fulfilled its purpose at the handover and no longer carries legal weight.
What does One Country, Two Systems mean for Taiwan?
Deng designed the formula for Taiwan. If it worked in Hong Kong, he believed, Taiwan might accept reunification voluntarily. Hong Kong's experience had the opposite effect. Taiwanese support for the formula was already low before 2020. By 2025, about 83 percent of Taiwanese said they opposed it. What happened in Hong Kong made the formula useless as a proposal for Taiwan, which had been its entire original purpose. The Chinese government has lost the only non-military reunification offer it ever had, leaving the options across the Taiwan Strait limited to coercion or an indefinite standoff.