Legal basis:
Article 3 of the Labor Contract Law
The conclusion of a labor contract shall follow the principles of lawfulness, fairness, equality and voluntariness, consensus and honesty. Labor contracts concluded in accordance with the law are binding, and the employer and the worker shall perform the obligations agreed in the labor contract.
Article 68 of the Labor Contract Law
Part-time employment refers to a form of employment in which workers are paid on an hourly basis, and in which the average daily working hours of workers in the same employer generally do not exceed four hours, and the total number of working hours in a week does not exceed twenty-four hours.
Article 69
The parties to part-time employment may conclude an oral agreement. A worker engaged in part-time employment may conclude an employment contract with one or more employers; however, an employment contract concluded later may not affect the fulfillment of an employment contract concluded first.
Regulations on the Implementation of the Labor Contract Law of the People's Republic of China
An employer who has not concluded a written labor contract with a worker for more than one month but less than one year from the date of employment shall, in accordance with the provisions of Article 82 of the Labor Contract Law, pay the worker twice his or her monthly wages, and shall conclude a written labor contract with him or her. Labor contract, the employer shall notify the worker in writing to terminate the labor relationship, and pay economic compensation in accordance with the provisions of Article 47 of the labor contract law.