Department of Auditing mainly exercises auditing and supervision to the financial revenues and expenditures and the authenticity, legitimacy and profitability of related economic activities of corporation and its subordinate companies (departments), and supervises the use of special funds; audits and supervises comprehensiveness, reasonableness and effectiveness of the internal control system of subordinate companies; audits business performance and management of subordinate companies; assists and cooperates with external auditors to audit the corporation and its subordinate companies.