The reason for this is the following：

1. If you work in a national administrative institution or a large state-owned enterprise with authority after graduation, you will transfer your household registration and files to the enterprise unit by letter transfer;

2. If you work in a private enterprise, individual enterprise, foreign-funded enterprise, etc. After graduation, your file and account will be linked to the talent exchange center;

3. For graduates who are not employed or assigned immediately after graduation, the school will also transfer their files to the corresponding graduate employment guidance center after the specified time.

If the tripartite agreement needs to be sealed by the company for confirmation, the following points should be noted:

1. Confirm whether the stamped company has the qualification and authorization: If the company needs to be stamped, it should be confirmed whether the company has the qualification and authorization such as business license and power of attorney of legal representative, so as to avoid false company or illegal stamping;

2. Confirm whether the company sealed is related to the agreement: if the company that needs to be sealed is not the signatory stipulated in the agreement, it should be confirmed whether the company has a direct or indirect relationship with the agreement to avoid the situation that the seal is invalid or causes disputes;

3. Confirm whether the company sealed has legal effect: If the company that needs to be sealed has no legal effect, such as unregistered or unauthorized company, its seal confirmation will not be recognized by law and should be treated with caution.

To sum up, when signing and sealing the tripartite agreement, we should pay attention to the qualifications, authorization and legal effect of all parties to ensure the legitimacy and effectiveness of the agreement. It is suggested that relevant parties should be carefully verified and investigated before signing the agreement to avoid unnecessary risks and disputes.

Legal basis:

Article 10 of People's Republic of China (PRC) Labor Contract Law

To establish labor relations, a written labor contract shall be concluded.

If a labor relationship has been established and a written labor contract has not been concluded at the same time, a written labor contract shall be concluded within one month from the date of employment.

If the employer and the employee conclude a labor contract before employment, the labor relationship shall be established from the date of employment.