The “One-China Principle” is arguably the most important and sensitive concept in the politics of the People's Republic of China (PRC). Its roots lie in the Chinese Civil War (1927-1949), which ended with the Communists (CPC) establishing the PRC in Beijing, and the Nationalists (KMT) retreating to Taiwan, continuing their government as the Republic of China (ROC).
Initially, both sides claimed to be the sole legitimate ruler of all of China, thus both agreed there was “one China.” Over time, the PRC's “One-China Principle” has become a rigid declaration that it is the only legitimate government, and that Taiwan is a province of China.
A crucial point for English speakers is the difference between the PRC's “One-China Principle” and the United States' “One-China Policy.”
PRC's Principle: An absolute, non-negotiable statement: “There is only one China in the world, Taiwan is part of China, and the government of the PRC is the sole legal government of China.”
US's Policy (and that of many other nations): A more ambiguous diplomatic stance. The U.S. acknowledges the PRC's position (it hears and understands it) but does not formally endorse it. This subtle wording allows the U.S. to maintain formal relations with the PRC while also maintaining unofficial relations with Taiwan.
This principle is tied to the deep cultural value of national unity and territorial integrity (领土完整), which has been a central theme throughout China's long and often turbulent history.
This phrase is not used in casual, everyday conversation. Its usage is almost always formal, official, and serious.
Diplomacy and News Media: This is the most common context. You will hear it constantly in official statements from the Ministry of Foreign Affairs, in speeches by top leaders, and on state-run news channels like CCTV. It is used to state China's position clearly to other countries. Any nation wishing to have diplomatic relations with the PRC must officially recognize the “One-China Principle.”
Business and Corporate World: International companies operating in China must be extremely careful not to violate this principle. On company websites, maps, and product packaging, listing Taiwan (or Hong Kong) as a separate country can lead to severe consequences, including government penalties and massive consumer boycotts. Airlines, hotel chains, and fashion brands have all had to issue public apologies for this mistake.
Social Media and Public Discourse: While not a “water cooler” topic, it becomes a flashpoint online during periods of political tension. Chinese netizens are often highly nationalistic on this issue and will fiercely defend the principle online against any perceived challenges.