During the Warring States period, with the development of productive forces, the old land system could not be implemented, and a new landlord class appeared. Their power gradually became stronger, demanding to change the original relations of production and establish a feudal system.

Reasons for the success of Shang Yang's political reform

(1) Shang Yang's political reform conformed to the trend of historical development. During the Spring and Autumn Period and the Warring States Period, slavery collapsed and the feudal system was established. Shang Yang's political reform conformed to the requirements of the times and the trend of historical development, which was the fundamental reason for the success of the political reform.

(2) Shang Yang's political reform was supported by the rulers. The political reform has been strongly supported by Qin Xiaogong, and the political reform measures have been resolutely implemented, which is an important reason for the success of the political reform.

(3) Shang Yang has a comprehensive plan, full publicity, win the trust of the people, such as moving a tree to establish a letter, and the content of the reform is deeply rooted in the hearts of the people.

(4) The spread of Legalism and Shang Yang's debate on conservative forces laid the ideological and theoretical foundation for reform and swept away the resistance to reform.

(5) attaching importance to agriculture and restraining business, so that the people have ample food and clothing, so they are supported by the people.