Rent Yongdian is a corvee and corvee system that is compatible with the equal-field system.

On March 6, 619 (February 15, the second year of Tang Wude), the rent adjustment method was initially decided. Regulation: Pay "rent" chestnut two stones every year. "Diao" depends on what is produced in the local area, and each year pays twenty feet of silk (or silk or drag) and three taels of cotton, or twenty feet of cloth and three kilograms of hemp.

In addition, corvee must be served every year for twenty days, and there are leap months plus two days; if you don't obey the rumor service, you can replace it with silk or cloth, which is equivalent to three feet of silk or three feet, seven inches and five minutes of cloth every day, which is called "mediocre." If the country needs to increase military service, any additional 15 days of service will be exempted, and any additional 30 days of service will be exempted from rent and transfer. The additional additional military service every year, including the main service, is not allowed to exceed 50 days. The Rent and Rent Adjustment Law also stipulates specific measures to reduce or waive rent and rent adjustment according to the severity of the disaster.

Zuyong Diao was a major tax system in feudal countries in the early Tang Dynasty.