Legal analysis: Bank loan income proves that bank running loans cannot be used. The proof of income requires the official seal of the work unit, and the running water of the bank is the proof of the income status of the supplementary loan applicant. Both materials need to be provided.

Legal basis: Article 17 of the Provisions of the Supreme People's Court on Several Issues Concerning the Application of Laws in the Trial of Private Lending Cases, the plaintiff filed a private lending lawsuit only on the basis of the transfer vouchers of financial institutions, and the defendant argued that the transfer was to repay the previous loans or other debts of both parties, and the defendant should provide evidence to prove his claim.