According to Article 17 of the Labor Contract Law:
The name, domicile and legal representative or principal responsible person of the employing unit; The name and address of the laborer and the number of the resident identity card or other valid identity documents; Term of labor contract; Work content and work place; In addition to the necessary provisions stipulated in the preceding paragraph, the employer and the employee may agree on probation, training, confidentiality, supplementary insurance and welfare benefits.
According to Paragraph 4 of Article 19 of the Labor Contract Law:
The probation period is included in the labor contract. If the labor contract only stipulates the probation period, the probation period is not established, and this period is the term of the labor contract. The employer only signs a probation contract, and if the probation period is not established, it may require the employer to make up the difference according to the official salary and renew the second labor contract. If the employer terminates the labor relationship, it shall pay one month's salary compensation according to the economic compensation standard.
Extended data:
Article 26 of the Labor Contract Law determines that the following labor contracts are invalid or partially invalid:
(1) Causing the other party to conclude or change a labor contract against its true meaning by means of fraud, coercion or taking advantage of the danger of others;
(2) The employer exempts itself from legal liability and excludes the rights of workers;
(3) Violating the mandatory provisions of laws and administrative regulations.
Any dispute over the invalidity or partial invalidity of a labor contract shall be confirmed by the labor dispute arbitration institution or the people's court.
Baidu Encyclopedia-People's Republic of China (PRC) Labor Contract Law