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.
According to the Interim Provisions on Wage Payment
Article 15 The employing unit shall not deduct the wages of workers. Under any of the following circumstances, the employer may withhold the wages of the workers:
(1) Personal income tax withheld and remitted by the employer;
(two) social insurance premiums withheld by the employer and borne by the individual workers;
(3) The alimony and maintenance expenses required to be withheld by the court's judgment or ruling;
(four) other expenses that can be deducted from the wages of workers as stipulated by laws and regulations.