On the one hand, we strongly advocate abstinence from extravagance and simplicity, and save money; On the other hand, actively implement the policy of "paying less taxes and being lenient to the people", so that farmers can gradually resume production and rebuild their homes. He fully promoted and popularized the system of equal land, recruited farmers who lost their escape, gave them land and encouraged them to engage in agricultural production. In order to solve the problem of insufficient cultivated land, he has repeatedly reduced the area of the garden to increase farmers' cultivated land. Due to the implementation of the land equalization system, farmers' production in Zhenguan period has been rapidly restored and developed. In order to reduce farmers' tax burden, Li Shimin also ordered tax relief, and at the same time vigorously advocated the construction of water conservancy projects to enhance their ability to resist natural disasters.