First of all, the extension statement should be signed and confirmed by all parties to the original contract.
Second, the time limit needs to be clearly extended. On the basis of the original contract, define the extension period agreed by both parties through consultation. Special attention should be paid to which party delayed the execution of the original contract, and then pay attention to the start date of execution and the solutions to similar situations in the process.
Third, the content of the main contract needs to be specified in the agreement, or the main contract should be taken as an annex.
Legal basis: People's Republic of China (PRC) Labor Contract Law.
Article 14 An open-ended labor contract refers to a labor contract in which the employer and the employee agree that there is no fixed termination time.
The employer and the employee may conclude an open-ended labor contract through consultation. Under any of the following circumstances, if an employee proposes or agrees to renew or conclude a labor contract, an open-ended labor contract shall be concluded in addition to the employee's proposal to conclude a fixed-term labor contract:
(1) The laborer has worked in the employing unit continuously for ten years;
(2) When the employing unit implements the labor contract system for the first time or the state-owned enterprise is restructured and re-concludes the labor contract, the employee has worked in the employing unit continuously for ten years and is less than ten years away from the statutory retirement age;
(3) Two fixed-term labor contracts have been concluded in succession, and the employee does not have the circumstances stipulated in Items 1 and 2 of Article 39 and Article 40 of this Law, and the labor contract is renewed.
If the employer fails to conclude a written labor contract with the employee within one year from the date of employment, it shall be deemed that the employer has concluded an open-ended labor contract with the employee.
Article 16 A labor contract shall come into effect after the employer and the employee reach an agreement through consultation and sign or seal the text of the labor contract.
The text of the labor contract is held by the employer and the employee respectively.