Tang Taizong was an outstanding politician in ancient China:
Attention should be paid to the lessons learned from the death of the Sui Dynasty, recognizing that the emperor should be diligent in political affairs, ministers should be honest and honest, and the government should pay less taxes and develop production, so that the rule can be consolidated;
He was good at employing people and attaching importance to receiving advice. During the Zhenguan period, famous ministers and generals came forth in large numbers, such as Fang Xuanling, Du Ruhui, and the outspoken Wei Zheng;
The system of three provinces and six ministries in the Sui Dynasty was continued and improved to increase the number of prime ministers and avoid the autocracy of prime ministers;
Consolidate prefectures and counties, eliminate the maladministration of "fewer people and more officials" in the early Tang Dynasty, and reduce the burden of the people.
We should attach importance to cultural education, improve the imperial examination system, and increase the number of examination subjects, with Jinshi as the most important;
Emperor Taizong of the Tang Dynasty won the support of all ethnic groups with a more enlightened ethnic policy, and all ethnic groups in the north respected him as "Tian Khan". Emperor Taizong also set up the Anxi Du amulet as the highest administrative and military organization to govern the Western Regions;
Emperor Taizong of the Tang Dynasty married Princess Wencheng to Zanpu Songzangampo of the Tubo, which strengthened the friendly relationship between the Tang and the Tubo and promoted the economic and cultural development of the Tubo.