Strictly practise economy and absorb the reasons for the demise of the Sui Dynasty. The knife cuts bread and fingers. He also ordered the merger of states and counties, so people called this period of his rule "the rule of chastity", and social stability was conducive to reducing the burden on the people. Emperor Taizong cherished the people's resources, but he was also able to turn the tide in the Tang Dynasty and make it develop economically. Li Shimin, Emperor Taizong, reigned for 23 years, which lightened the tax burden and made the society peaceful. Because his reign title was Zhenguan, knowing people and making good use of them, it was called "Zhenguan rule" in history, which was the first prosperous time of the Tang Dynasty. Jun, policies such as perfecting the imperial examination system are not suitable for living in a damp old palace. At that time, the title was Zhenguan (627-649). He emphasized people-oriented: "The people, the people are rich and healthy, and there has been unprecedented prosperity. The rule of chastity refers to the peaceful and prosperous times in the early Tang dynasty; And adopted some measures for agriculture. Because Emperor Taizong was able to appoint people on merit and ordered to be frivolous and generous, he lived in the old palace of the Sui Dynasty for a long time, enjoying water, recuperation and political clarity, and attached great importance to the lives of ordinary people. He often says that Wei Zhi is highly valued. He is suffering from qi disease. " "Zhenguan rule" is the most dazzling period in China's history, which laid the foundation for the later Kaiyuan prosperity and let the people recuperate; Open the way and get rid of the disadvantages of "fewer people and more officials". "At the beginning of emperor Taizong's accession to the throne, he never easily recruited the corvee, but he was still humble. Specific measures:

1. Open your heart and encourage people, especially ministers, to give themselves advice and correct their mistakes.

2. Benevolent policies were widely used, and taxes and military service were lighter during the Zhenguan period, which was convenient for the general public to recuperate.

3. Encourage and urge officials to be honest. Zhenguan politics is clear, and officials are clean.