Because during the reign of Emperor Taizong of Li Shimin, he cultivated politics, put agriculture first, practiced economy, and loved the people like children. He also implemented a series of political measures to benefit the country and the people, so that the people lived a stable and prosperous life and everyone lived and worked in peace and contentment. He respects life, speaks freely, is open-minded, attaches importance to talents, respects frontier ethnic customs and stabilizes the frontier, and has made outstanding achievements in politics, economy, culture and diplomacy. So everyone loved the king very much, and later generations spoke highly of him.

Li Shimin killed his brother on July 2nd, 626. He launched the Xuanwumen rebellion? , killed the prince's brother Li. At that time, he was an indecisive man. When he established a prince, he hesitated between Li He. Because Li Shimin has made remarkable achievements since the founding of the People's Republic of China, he has put down many powerful separatist forces and has a high reputation in North Korea. Although Li was the eldest son, he could not compare with him in military achievements and intelligence, but he was later made a prince.

Because of his vacillating attitude, Li and Li fought with each other in the court, forming two factions. Among them, Pei Ji, Wang Jue, Li Yuanji and others followed Prince Li. Du Ruhui, Fang, Qin, Wuji, etc. On the side of Li Shimin, the king of Qin. The prince spoke ill of the king of Qin in the harem, which led Li Yuan to believe these words of the concubines. Later, when he learned that the prince was going to get rid of himself, he pre-empted Li and Li Yuanji by setting a tight encirclement at Xuanwu Gate in Chang 'an Miyagi. Li was shot dead with an arrow on the spot, and Li Yuanji was killed by Weichi Gong on his way to Qi.

Later, Li Yuan made Li Shimin the Crown Prince. On September 4, 626, Li Yuan abdicated as the Emperor's Father, and Li Shimin officially succeeded to the throne. During the reign of Emperor Taizong of Li Shimin, the title of the country was Zhenguan, which is well known in history? Zhenguan rule? . Under his rule, the Tang Dynasty was prosperous and peaceful, and ethnic relations were harmonious. He is respected by ethnic minorities? Khan? .