Legal analysis: In a bank, the supervisor needs to sign the loan by himself. The supervisor plays the role of supervision, monitoring the authenticity of the lender's information, and at the same time allowing the borrower to repay the loan in time.

Legal basis: People's Republic of China (PRC) Commercial Bank Law.

Article 5 Commercial banks should follow the principles of equality, voluntariness, fairness, honesty and credibility in their business dealings with customers.

Article 6 Commercial banks should protect the legitimate rights and interests of depositors, and no unit or individual may infringe upon them.

Article 7 Commercial banks should strictly examine the credit standing of borrowers when conducting credit business, so as to ensure the timely recovery of loans.

Commercial banks recover the due principal and interest of loans from borrowers according to law, which is protected by law.

Article 8 Commercial banks shall abide by the relevant provisions of laws and administrative regulations when conducting business, and shall not harm the national interests and social public interests.