As we all know, during the Song Dynasty, China clashed with many nomadic peoples, and the Northern Song Dynasty was wiped out by the Jurchen. Later, Song Gaozong re-established the Southern Song Dynasty in the southern region and continued to fight against Xu Jin forces. The capital of the Southern Song Dynasty is in today's Hangzhou. Many people find it strange, because Hangzhou was not an ancient capital at that time, and Nanjing next door was the ancient capital of Long Mai. They think why he didn't choose Nanjing. In fact, Song Gaozong chose Hangzhou instead of Nanjing.
First of all, because of the geographical location, Song Gaozong was preparing for the future escape. Because Nuzhen was relatively strong, it was estimated that Mongolia would not appear at that time. Therefore, in order to avoid Nuzhen's army, because Nuzhen's horses were stronger than Song Dynasty, if its capital was in Nanjing, it would be easy to attack, while in Hangzhou, it was close to the sea, so it was possible to escape at any time.
And at that time, Song Gaozong was trying to make peace with Xu Jinguo, so now we can't rush to build a high-profile capital, but choose Hangzhou, an unknown city at that time, because once it is set in Nanjing, the ancient capital of a thousand years, it is easy for Nuzhen to think that you want to restore the country, which will also have a certain impact on the future resistance to gold.