Labor outsourcing is not a legal concept. The core content is that the employer hands over part of its business or work content to the contractor, and the employer pays the outsourcing fee to the contractor according to the agreement. The outsourced business or work content is generally the non-core business of the employer. In practice, many contracting contracts and entrustment contracts can be classified as labor outsourcing. Common forms of labor outsourcing include production line outsourcing, warehousing and logistics outsourcing, auxiliary post outsourcing (such as security, cleaning, catering, etc.), short-term project outsourcing, human resources outsourcing, training and consulting outsourcing, etc.