In the past, you sent a Business Transfer Letter to your work unit through the labor bureau where the state-owned enterprise is located. You handled the transfer formalities with the Business Transfer Letter. Regarding the process, you can consult the deployment department of the local labor bureau. If there is no Business Transfer Letter now, you can only resign from school and go to the state-owned enterprise to go through the entry formalities. The state-owned enterprise will transfer your file to the state-owned enterprise through the Transfer Letter, and you can continue your service with the file. At the same time, when you leave school, open the social security payment list at 840 to retrieve the endowment insurance manual, and then hand it over to the human resources management department at the state-owned enterprise, and they will go through the formalities for transferring the social security relationship to you. It is not difficult to say that it is difficult. The key depends on the attitude of the state-owned enterprise. If they insist on you, it will be handled smoothly.