Why can the labor law be subdivided after the founding of New China?

Employment system and labor contract system.

1. labor and employment system: the state actively develops, rationally utilizes and effectively manages human resources through various channels to promote economic construction and social development.

2. Labor contract system: A labor contract is an agreement between a worker and an employer to establish a labor relationship and clarify the rights and obligations of both parties. A written labor contract shall be concluded to establish labor relations.