Combined with historical facts, this paper discusses why Emperor Taizong was an outstanding politician.

Politically, during the period of Emperor Taizong, the policy of light corvee and tax reduction was adopted. During this period, agriculture in the Tang Dynasty developed greatly, and the population also increased to a great extent, because in ancient times, the economy of a dynasty was evaluated by its population and grain reserves. At the same time, Emperor Taizong was kind to coachable and promoted a large number of talents, which was also very helpful to later generations.

In diplomacy, Emperor Taizong was respected by many ethnic minorities in the border areas and was called "Tiankhan".

Economically, he initiated the rule of Zhenguan, which laid a good foundation for the prosperity of Kaiyuan.

So he is an outstanding politician.