What should I do if I need to prove that I worked in the original unit because the original unit was acquired?

Legal analysis: 1, public to public: Please bring a letter of introduction or an official letter to your former unit, at least let your colleagues in the personnel department of your current unit know that you have left your job; 2. I need to negotiate with the new company whether to approve the resignation facts and responsibility guarantee for the new company; 3. Use the interpersonal relationship of the original unit to solve it flexibly and properly.

Legal basis: Article 50 of People's Republic of China (PRC) Labor Contract Law. The employing unit shall issue a certificate of dissolution or termination of the labor contract at the time of dissolution or termination, and go through the formalities for the transfer of files and social insurance relations for employees within 15 days.

Laborers shall handle the work handover according to the agreement of both parties. If the employing unit should pay economic compensation to the workers in accordance with the relevant provisions of this law, it should pay it when the work handover is completed.

The employing unit shall keep the text of the dissolved or terminated labor contract for at least two years for future reference.