It's Beijing.

Beijing subway planning began in 1953, construction began in 1965, and the earliest line was completed in 1969. It is the first subway system in Greater China.

In the 1950s, Mao Zedong had an insight into the importance of underground railways, and advocated that Beijing should build urban underground railways from the perspective of war preparedness and civilian use, and pointed out that "not only Beijing must build urban underground railways, but many big cities must also build them." On September 28, 1953, the Beijing Municipal Committee of the Communist Party of China

In response to this call, preparations for the construction of a subway in Beijing began.

In 1965, the Secretariat of the Central Committee of the Communist Party of China and the State Council decided to build the Beijing Subway.

On February 4, Mao Zedong personally reviewed the Beijing subway construction plan and determined the eight-character policy of "meticulous design and careful construction" in his instructions.

On July 1, the first phase of the Beijing Subway project started. Many national leaders, including Zhu De and Deng Xiaoping, as well as Beijing Mayor Peng Zhen attended the groundbreaking ceremony.

On January 26, 1991, the plan for the east extension of Beijing Subway Line 1 along Chang'an Street (i.e., the "Fuba Line", extending from Fuxingmen to the Bawangfen area) was approved, with a total investment of 800 million yuan, of which from Japan Overseas

The cooperative fund loan is 19.2 billion yen.

On June 28, 2000, Beijing Subway Line 1 was fully operational.

Extended information: The best of other subways in China: 1. The longest subway line: Shanghai Metro Line 11.

2. The first intercity subway and the first subway line across municipal administrative districts: Guangfo Line.

3. The first subway line across provincial administrative regions: Shanghai Metro Line 11.

4. The first subway line that forms a loop at once: Chengdu Metro Line 7.

5. The longest circular subway: Beijing Subway Line 10.

6. The shortest subway line: Taipei MRT Xinbeitou Branch Line (total length 1.2 kilometers).

7. The subway line with the most stations: Beijing Subway Line 10 (maximum 45 stations).

8. The shallowest subway line: Tianjin Metro Line 1 (the shallowest point is only 2-3 meters deep, it can be said to be the shallowest subway in the world).