First of all, the early death of his two brothers provided him with opportunities. Li Bin, the Duke of Tang, has four sons, namely the eldest son Li Cheng, the second son Li Zhan, the third son Li Hong and the fourth son Li Yuan. According to historical records, Li Cheng, the king of Liang, and Li Hong, the king of Hanwang, died young and had no heirs. Li Zhan, the king of Shu, also died young, leaving two sons.

Besides, Li Yuan and Ethan like to make friends. Network is the foundation of the country. Being connected and being hugged means that everyone will help you and support you. Li Yuan liked to make friends when he was very young, so many friends supported him very much. Therefore, Li Yuan laid a good foundation for the late Li family. This is the place where Li Bin, the father of Tang gaozu, looks down on him most.

Secondly, Li Yuan was highly praised by Emperor Wen of Sui Dynasty. When he was young, Li Yuan was able to haunt the imperial court from time to time because of his blood relationship with the emperor. Emperor Wendi of Sui paid special attention to Tang Yuan, who was easy-going. Therefore, for the sake of the family's century-old plan, Li Bin appointed Tang Yuan as the heir and let him inherit the title of Tang Gong. No matter whether Li Yuan inherited actively or passively, he made great contributions to the establishment of the Tang Dynasty. Emperor Jianwen of Sui Dynasty was very fond of Li Yuan. For a long time, it is a thousand cows around Yang Jian, which is equivalent to Yang Jian's personal bodyguard. Yang Jian's love is also an important reason why Li Yan passed on the position of heir to Tang gaozu. Otherwise, even the intelligence of Li Shimin, Emperor Taizong, could not dominate the world in the society that advocated family status at that time.

in the power struggle, the law of the jungle applies. Whoever has the greatest power and the most complicated means will be able to hold power. Even after Yuwen Yong killed the powerful Yu Wenhu, he did not have absolute power control. There were eight pillars in the Western Wei Dynasty. There is a huge power group behind this eight-pillar country. Among them, Li Tan's father, Li Hu, was the Duke of Tang, one of the Eight Pillars countries, and governed Longxi County. And Li Bin's wife is also the daughter of Duguxin, one of Hanoi's eight pillars, namely Wei Gong. Visible, Li Bin family power, in the Northern Zhou Dynasty is quite powerful.