Differences: 1. Different ownership systems: The well-field system is state-owned land, and feudal land ownership includes state-owned land ownership, landlord land ownership, and peasant land ownership.

2. Whether it can be bought and sold freely: The land under the well-field system is controlled by the lord, and the lord can take it back. The key to private ownership of feudal land is that the land can be bought, sold and transferred freely without interference from others.

3. Differences in class: The well-field system is a product of the slave class, and feudal land ownership is a product of feudal society.

4. Different historical stages: the well-field system was from the Shang Dynasty to the Zhou Dynasty, and the feudal land ownership system was a product after the Spring and Autumn Period and the Warring States Period.

"Jingtian" refers to the 900 acres of land divided into nine blocks, each block is 100 acres, and eight families farm the 100 acres of public land in the middle. Each family has 100 acres of private land, and they need to pay taxes.

The harvest of one hundred acres of private land is paid, so the tax is one-ninth of the year's harvest. This tax method takes away one-ninth of the field's harvest.