Jin is also a dynasty. Actually, I don't think the Southern Song Dynasty is like a dynasty. China is a multi-ethnic country. Although Jin is a minority regime, it is also a part of the Chinese nation, and it is the same regime as the Southern Song Dynasty (but I don't think it counts, because the Southern Song Dynasty did not unify the Central Plains), so it is a dynasty. This is an analysis: the dynasty change of a country should be like this. During the opposition between Song and Jin Dynasties, Chang 'an, Luoyang and Kaifeng were all under the rule of Jin Dynasty. Geographically speaking, gold is the country of the Central Plains, and among many reasons, I think this is the most important. Even from the subjective national point of view, we can say that the Han nationality is an orthodox nationality, and the king under the Han nationality is also orthodox. However, in the ancient geographical concept of China, whether it is South China, Xixia, Korea or Lingnan, they all belong to the marginal areas outside the Central Plains. Although the Southern Song Dynasty inherited the legal system of the Northern Song Dynasty, it was a marginalized regime. It inherited the theoretical legal system left by the Northern Song Dynasty, but lost the Guanzhong and Heluo areas, which symbolized the actual legal system and the status of the central state, and decided that the Southern Song Dynasty was transformed from a central empire to a local kingdom. Even the Southern Song Dynasty itself called Hangzhou Hangzi, and its understanding of its geography was obvious. The surrender of the Song Dynasty to Jin was also decisive. The credentials given to Jin by the Southern Song Emperor are all on the table. The Southern Song Emperor has to go down to the main hall or kneel down to accept Jin's credentials. Although it is uncertain whether the Southern Song Dynasty once regarded gold as the authentic new moon in history, it is not important to read the above credentials to Jin Xizong. Some people may not want to admit it, but at this time, the Southern Song Dynasty, like Korea and Dali, was a vassal state of Jin. Perhaps the Southern Song Dynasty was an era for the Han nationality, but it was only a marginal country, even a marginal small country, for the whole China and all the ethnic groups living in China at that time. For all the nationalities at that time, only the Jin Dynasty represented that era. The population of Sanjin was 48 million, and that of Southern Song was 28 million. Although this figure may not be exact, we can be sure that the population of the Jin Dynasty is not only Han nationality, but it certainly accounts for the vast majority. Even though the total population of the Jin Dynasty and the Southern Song Dynasty are not as large as the figures show, both the total population and the number of Han people in the Jin Dynasty are definitely more than those in the Southern Song Dynasty. Judging from the ethnic composition and the establishment of political power, Jin was not established by the main ethnic groups in China, but its legitimacy was recognized by all ethnic groups in China, including the Southern Song Dynasty. Judging from the population composition, the number of main ethnic groups in Jin is more than that in Southern Song Dynasty. Although the Jin Dynasty was founded by ethnic minorities, it was a multi-ethnic country. In the Southern Song Dynasty, not only the main ethnic group was the Han nationality, but also the main ethnic group was the Han nationality, and there were more Han people than in the Southern Song Dynasty. Therefore, from the point of view of population composition, whether it is Han nationality or national composition, Jindu, therefore, in any respect, the Southern Song Dynasty can only be a political power in the history of China, and its status is essentially the same as that of the Western Xia Dali Koryo. As the central country and the orthodox Central Plains, Jin should be regarded as a formal dynasty in the history of China.