Legal analysis: According to the relevant laws of our country, when writing the supplementary agreement of labor contract, the premise must be stated first, that is, in accordance with the provisions of China's labor law, in order to safeguard the legitimate interests of both parties, it should be signed after equal and voluntary consultation. Secondly, it is necessary to clearly define the necessary information of both employers and workers, the main contents of labor, the rights and obligations of employers and the rights and obligations of workers. Then, if there are confidential matters, it is necessary to divide the scope of confidentiality and stipulate other precautions.

Legal basis: Article 17 of People's Republic of China (PRC) Labor Contract Law shall contain the following clauses:

(a) the name, domicile and legal representative or principal responsible person of the employing unit;

(2) The name and address of the laborer and the number of the resident identity card or other valid identity documents;

(3) The term of the labor contract;

(4) Work content and work place;

(five) working hours and rest and vacation;

(6) Labor remuneration;

(7) Social insurance;

(eight) labor protection, working conditions and occupational hazard protection;

(nine) other matters that should be included in the labor contract as stipulated by laws and regulations. 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.