Where an employer provides special training expenses and professional technical training for workers, it may conclude an agreement with the workers 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. Those who do not provide professional and technical training, or only provide induction training, are not professional and technical training, and workers who resign early do not need to pay liquidated damages. Even if there is a fine of 2000 yuan for resigning early, this clause is invalid. In case of dispute, the laborer may complain to the labor inspection brigade or apply for labor dispute arbitration. Article 22 of the Labor Contract Law stipulates that if an employer provides special training fees for workers and conducts professional and technical training, it may conclude an agreement with the workers 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.