If the employer has signed a labor contract with the employee, the service period may be stipulated in the labor contract. If an employee leaves his post before the service period after training, the employer may require the employee to pay liquidated damages.

According to the Labor Arbitration Law

Article 2 This Law shall apply to the following labor disputes between employers and employees in People's Republic of China (PRC):

(1) Disputes arising from the confirmation of labor relations;

(2) Disputes arising from the conclusion, performance, alteration, dissolution and termination of labor contracts;

(3) Disputes arising from delisting, dismissal, resignation or resignation;

(4) Disputes arising from working hours, rest and vacation, social insurance, welfare, training and labor protection;

(five) disputes arising from labor remuneration, medical expenses for work-related injuries, economic compensation or compensation;

(six) other labor disputes as prescribed by laws and regulations.

Article 27 The limitation period for applying for labor dispute arbitration is one year. The limitation period for arbitration shall be counted from the date when the parties know or should know that their rights have been infringed.

The limitation of arbitration prescribed in the preceding paragraph shall be interrupted because one party claims the rights of the other party, or requests the relevant departments to provide rights relief, or the other party agrees to perform its obligations. The limitation of arbitration shall be recalculated from the time of interruption.

If the parties fail to apply for arbitration within the time limit stipulated in the first paragraph of this article due to force majeure or other legitimate reasons, the arbitration period shall be suspended. The limitation period of arbitration shall continue to be counted from the date when the reasons for suspension of limitation are eliminated.

If there is a dispute over the arrears of labor remuneration during the existence of labor relations, the employee's application for arbitration is not limited by the limitation period of arbitration stipulated in the first paragraph of this article; However, if the labor relationship is terminated, it shall be proposed within one year from the date of termination of the labor relationship.

According to the Labor Contract Law

Article 22 Where an employing unit provides special training fees and professional technical training for laborers, it may conclude an agreement with the laborers to stipulate the service period.

If the laborer violates the service period agreement, he shall pay liquidated damages to the employer in accordance with the agreement. The amount of liquidated damages shall not exceed the training expenses provided by the employer. The liquidated damages that the employer requires the laborer to pay shall not exceed the training expenses that should be shared for the unfinished part of the service period.

If the employer and the employee agree on the service period, it will not affect the employee's improvement of labor remuneration in accordance with the normal wage adjustment mechanism during the service period.