Performance: politically: 1. Emperor Taizong was able to learn the lessons of the demise of the Sui Dynasty, be prepared for danger in times of peace, and know people well. Emperor Taizong appointed wise ministers such as Fang and Du Ruhui, and coachable was open-minded and accepted criticism from others. 2, the implementation of the rule of virtue, temper justice with mercy, ease social contradictions. 3. Streamline institutions and be thrifty. Abolish redundant officials and clarify official management; 4. Improve the imperial examination system, expand the scale of Chinese studies and select talents; 5, improve the "three provinces and six departments", the national order is good. Economically: Emperor Taizong practiced the people-oriented policy, recuperated and paid no attention to taxation. Attach importance to agricultural production and make the depressed social economy recover quickly; Ethnic policy: Emperor Taizong practiced an enlightened ethnic policy. On the one hand, he resolutely cracked down on the Turkish invasion, but he was lenient with the Turkish leaders and people. All ethnic groups in the frontier revered Emperor Taizong as "Tiankhan"; On the other hand, the ties between China and Tibet were strengthened, and Princess Wencheng had a close relationship with Songzan Gampo, which made the relationship between Tang and Tibet even closer. Foreign exchanges: Xuanzang was sent to the west to visit Tianzhu to strengthen friendly exchanges and exchanges between China and India.

Influence: Emperor Taizong was an outstanding politician in China feudal society. A series of policies and measures have brought political clarity, social stability, production development and cultural prosperity, and formed the rule of chastity. It laid a solid foundation for the prosperity of Kaiyuan, the peak of China feudal society in later generations.