1. Audit of bill integrity. First, check whether the source channel of the audited unit's bills is legal, whether there are illegal self-printing receipts, illegal purchase receipts or other problems against the bill collection (purchase) register; First, check whether the source channel of the audited unit's bills is legal, whether there are illegal self-printing receipts, illegal purchase receipts or other problems against the bill collection (purchase) register; The second is whether the recipients are standardized, and there are cases where accountants receive bills; Third, for the approved use of self-made receipts, it is necessary to find out the printing quantity and inventory approved by the financial department and confirm the actual use quantity.

2. Audit of cancellation of bills;

iii. audit the authenticity and rationality of the bills issued;

iv. Audit of invalid bills;

5. audit the authenticity of the receipts and service invoices obtained by the competent authorities from their subordinate units.