This is mainly determined by its geographical location and strategic location.

Beijing is located at the junction of the Yanshan Mountains and the North China Plain. It has a superior geographical location and an important strategic location. Since the Spring and Autumn Period and the Warring States Period, it has been Jicheng, the capital of Yan State. It has since been an administrative center at the local level.

For the Central Plains people, Beijing has always been a frontier in the north, so they will not come here to build their capital, but will take Luoyang, Xi'an and other places as their centers. With the rise of the northern ethnic groups, the Beijing area became a place where they competed repeatedly with the Central Plains regime. For the northern peoples (especially the Yuan Dynasty established by the Mongols), Beijing has become the center of their territory.

Therefore, the northern peoples attach great importance to this place. In the Liao Dynasty, it was upgraded to Liao Zhongjing, in the Jin Dynasty it was the Jin Zhongdu, and in the Yuan Dynasty it was even regarded as the capital, the political center of the vast Yuan Empire. As the King of Yan in the Ming Dynasty, Zhu Di had been running the north. He was familiar with the land, people and conditions in this area. It can be said that his foundation was here.

Only in Beijing can his throne be secure, knowing the importance of northern border defense. Although the Yuan Dynasty was overthrown, the remaining forces still existed and were the greatest threat to the Ming Dynasty. The capital was moved to Beijing to facilitate contact and control of the various ethnic groups in the north, thereby consolidating the northern border defense. So when he ascended the throne, he decided to move the capital from Nanjing to Beijing, against all opinions.

Extended information:

Source of the Forbidden City:

Since the Yuan Dynasty, it has become the capital of China. The capital of the Yuan Dynasty, Yuan Dadu, or Dadu. Since Kublai Khan was the Great Khan of the Mongolian Khanate, it was called "Khan Bali" in Mongolian, which means "the residence of the Great Khan". The city site of Yuandadu is located in the urban area of ??present-day Beijing, extending to the ruins of Yuandadu City in the north, Chang'an Street in the south, and the Second Ring Road in the east and west.

The Ming Dynasty began to carry out large-scale expansion of Beijing after its founding. The Qing Dynasty also carried out some repairs and expansions on the basis of continuing the Ming Dynasty Beijing City. By the end of the Qing Dynasty, Beijing had become the largest city in the world.

The Forbidden City means the imperial palace in the old days. It is the name given by the later dynasty to the palace of the previous dynasty in history. Just like in the Ming Dynasty, most of the Yuan Dynasty was called the Forbidden City. After the fall of the Ming Dynasty, the Forbidden City continued to be used by the Qing Dynasty. It was not called the Forbidden City until the fall of the Qing Dynasty.

The Forbidden City was originally called the Forbidden City. The origin of this name is even more interesting.

Legend has it that the heavenly palace where the Emperor of Heaven lives is called the Purple Palace, and the feudal emperor claimed to be the son of the Emperor of Heaven. Therefore, his residence should also be equivalent to the "Purple Palace" in the sky. In addition, the palace is heavily guarded. , is a forbidden city that is inaccessible to ordinary people, hence the name "Forbidden City".

The Forbidden City is located in the center of Beijing, also known as the "Forbidden City". 24 emperors once lived here. It was the imperial palace of the Ming and Qing dynasties (1368-1911 AD) and is now the "Forbidden City Museum". The entire building of the Forbidden City is magnificent, majestic and gorgeous. It is known as one of the five major palaces in the world and is listed as a "World Cultural Heritage" by UNESCO.

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Baidu Encyclopedia-Forbidden City in Beijing