Objectively speaking, it is not legal to let employees be laid off by buying out the length of service at one time. China's laws and regulations clearly stipulate that "no unit may terminate the social insurance relationship of employees by means of' buyout service'." "No department or unit may, in violation of the relevant provisions of the state, terminate the social insurance relationship of employees during the sale of enterprises, or use the opportunity of sale to' buy out' the length of service of employees or handle early retirement for employees and push employees to the society." If a labor dispute occurs due to the decision of the employer to dismiss, remove from the list, dismiss, terminate the labor contract, reduce the labor remuneration, and calculate the working years of the workers, the employer shall bear the burden of proof. "That is to say, if you think the company's practices are unreasonable, you can not accept such conditions.
To sum up, the length of service has been banned by the state and is illegal. If there are still enterprises that require laid-off workers to buy out their length of service at one time, and they have not reached an agreement with the employees, the employees may bring a lawsuit to the people's court according to law.
This kind of case, whether arbitration or litigation, should be given by the employer. If the company still has a one-time compulsory buyout of the length of service, and the employer forces it, you can not accept such conditions. If negotiation fails, the company forces you to terminate the contract, and you can bring a lawsuit to the people's court according to law. And the burden of proof is borne by the unit.