1. Revenue audit: For example, for a catering enterprise, auditors can check revenue records, customer orders, invoices, cash records, etc. To ensure the accuracy and integrity of enterprise income.

2. Inventory audit: In the fields of industry, wholesale and retail, auditors can check the inventory of enterprises, compare the actual inventory with the book inventory, check the reasons for inventory changes and inventory pricing methods to ensure the accuracy of inventory.

3. Expense audit: Auditors can check the expense records and reimbursement records of enterprises, and compare the date, amount, reasons and other information of expenses to ensure the accuracy and legality of expense records.