Zhao Gou is the ninth son of Song Huizong, his mother is Wei Xianfei, who is named King Kang. In 1126, when the Jin army besieged Bianjing for the first time, he entered the Jin camp as a hostage. In the winter of the same year, he was ordered to go on an envoy again. When he passed through Cizhou, he was persuaded by Zong Ze to stay. Later, he opened the Hebei Military Marshal's Mansion in Xiangzhou. When the Northern Song fell in 1127, he ascended the throne in Yingtian Mansion, Nanjing, changed the Yuan Dynasty to Jianyan, and rebuilt the Song Dynasty as the son of Huizong.
After taking the throne, the Jin army moved southward for many years. He withdrew all the way from Yangzhou and Hangzhou. In 1129, he encountered a Miao and Liu rebellion in Hangzhou. The following year, he fled to the sea to avoid the enemy. Generals such as Yue Fei, Han Shizhong, and Wu Jie fought against the Jin in various places, and the situation gradually stabilized, and Lin'an was established in 1138. He devoted himself to negotiating peace and put Qin Gui in the most important position. In 1140, when Yue Fei's Northern Expedition was victorious, he ordered his troops to retreat. The following year, he took back the military power of the generals, signed a Shaoxing peace treaty with Jin, and unjustly killed Yue Fei on "unfounded" charges.
After the peace talks, the pattern of N & S confrontation was fixed. On the one hand, Gaozong paid tribute to Jin as a vassal, and on the other hand, he restored the economy in Jiangnan, developed overseas trade, and issued huizi. In 1161, the Jin Prince of Hailing invaded the south and was repulsed. The following year, he abdicated to his adopted son Zhao Shen on the grounds that he was old and tired of politics, and retired to Deoksugung Palace as the Retired Emperor. He died in 1187 at the age of eighty-one.
Gaozong rebuilt the Song Dynasty when his country was ruined and his family was destroyed, and he preserved the southern half of the Yangtze River, which provided conditions for economic and cultural prosperity in the next 150 years. He attached great importance to overseas trade and the issuance of huizi, and he also had a pragmatic vision. However, he feared the enemy and sought peace, and would rather surrender and pay tribute to preserve his throne. When the situation against the Jin Dynasty improved, he destroyed the Great Wall and unjustly killed Yue Fei. He also condoned Qin Gui's autocratic power. Later generations' criticism of him mainly focused on this.