The appearance of this term is due to the split between the two sides of the Taiwan Province Strait caused by the opposition between China Kuomintang and Chinese mainland after the civil war between the Kuomintang and the Communist Party. (There are two other conceptual explanations, each of which is different according to usage. It is not an official place name in the official statistics of the whole country. )?
Mainland is a geographical area, which refers to the territory actually ruled by People's Republic of China (PRC) (PRC) except Hongkong, Macau and Taiwan Province. Now it is also called the territory of China, just like the domestic area. It can also refer to the inland of China or the part closer to the inland center than the coast or frontier.
Extended data:
There is a difference between Chinese mainland and Chinese mainland. Due to the political and geographical factors in Hongkong, Macau and Taiwan Province, the specific meaning of this word varies in different contexts and places of use. Since Hong Kong and Macao are geographically connected with land, the central authorities are generally called "Chinese mainland" or "mainland" after the reunification.
The practice of People's Republic of China (PRC) (PRC) official media is to use "mainland" instead of "mainland" when referring to Hongkong and Macau. When referring to Taiwan Province Province, we will not use "mainland", but "mainland" or "Chinese mainland".
In China, the normative concept corresponding to the Hong Kong Special Administrative Region and the Macao Special Administrative Region should be "Chinese mainland". At present, the Hong Kong SAR Government and the Macao SAR Government also use the concept of "China Mainland" to refer to the central government.
Baidu Encyclopedia-Chinese mainland