The reason why the Tang Dynasty can leave a deep impression in history is not only because of the unprecedented prosperity of that era, but also because the Tang Dynasty produced the first empress Wu Zetian in Chinese history. There were many women in power in history, but after power finally returned to men, their families were often exterminated, such as Lv Hou in its heyday. Wu Zetian saw through the prosperity of her later years and chose to return to Li Tang, but the Wu family remained stable for generations until the reign of Emperor Xuanzong of the Tang Dynasty. The reason is that Wu Zetian has integrated the two families during his reign, and dealing with the Wu family will inevitably bring harm to the Li family; Secondly, when Wu Zetian was in power, she put the Wu family in some important positions, which involved the issue of military power. In addition, Wu Zetian succeeded to the throne with her own son, and of course she would not kill her ancestors.

It is said that when Wu Zetian came to power, she certainly promoted some members of her family. The Wu family is not a big family, so although there are many descendants, few people really succeed. For example, Wu Zetian's brothers were not good to Wu Zetian before because of their mediocre qualifications. Wu Zetian not only did not give them benefits, but disposed of them. However, there are exceptions. Wu Sansi, Wu Zetian's most valued nephew, made great efforts to suppress Li's forces.

Wu Zetian also married Wu Li, tying the two families in the same boat, leaving a way out for the future. For example, the most favored Princess Taiping married Wu's.

Of course, although Wu Zetian proclaimed himself emperor, she didn't have the guts to give up the throne to the Wu family, so as long as her son inherits the throne, the regime will return to Li's hands, and considering the blood relationship, the heir will not kill the Wu family.