In the first year of God's will (690), Wu Zetian proclaimed himself emperor, changed his country name to Zhou, made Luoyang his capital and established Wu Zhou. Before and after he took office, he was "observant and good at judging", with more powers and less responsibilities, and paid attention to selecting talents, thus creating the system of palace examination, martial arts and trial officials.
It also rewards farmers and mulberry trees and reforms official management. At the same time, the imperial clan of the Tang Dynasty was massacred, and "cruel officialdom politics" arose. Militarily, the four towns of Anxi were recovered, which once led to the post-Turkic rebellion. In his later years, he gradually became extravagant and arbitrary, and gradually degenerated.
Extended data:
The reason why Wu Zetian moved to Luoyang.
First of all, politically speaking, since Wu Zetian wants to be emperor, it is possible that she wants to avoid the Li Tang dynasty. After all, new things, new atmosphere, all want to change the dynasty, and she is a little politically different.
Economically, Luoyang is the most prosperous. On the basis of Yang Di Yang Guang's opening of the Beijing-Hangzhou Grand Canal, Luoyang is more prosperous and its economy is far ahead. Moreover, land and water transportation are very convenient, which should also be a major reason why Wu Zetian moved the capital.
Baidu Encyclopedia-Wu Zetian