Is it reasonable for employees to leave their jobs within six months after enjoying the company's business trip allowance and pay compensation to the company?

First of all, there is no such statement in the law.

Secondly, I don't know if there is such an agreement in the labor contract between you and your unit, or related liquidated damages. If there is such an agreement, can it be implemented according to the agreement? No problem. If there is no agreement, the company's behavior is illegal. You can complain to the local labor inspection brigade or apply to the local labor arbitration commission for arbitration.

Laws relating to employees' liability.

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.

Article 23 The employer and the employee may agree in the labor contract to keep the employer's business secrets and confidential matters related to intellectual property rights.

For the workers who have the obligation of confidentiality, the employer may stipulate the non-competition clause with the workers in the labor contract or confidentiality agreement, and stipulate that after the labor contract is dissolved or terminated, the economic compensation will be paid to the workers on a monthly basis during the non-competition period. If the laborer violates the non-competition agreement, he shall pay liquidated damages to the employer in accordance with the agreement.

I hope I can help you! Please adopt! thank you