Sub-branches are branch management institutions of banking financial institutions. It is the head office of regional banks and can manage savings offices and branches. As a financial institution, in order to strengthen management and carry out various financial businesses, the organizational structure of banks is: Head Office-tier-one branches (provincial banks)-tier-two branches (city banks)-tier-one branches (districts, counties and county-level cities)-tier-two branches (branches or savings offices) manage related businesses. Bank branches are mainly responsible for the approval of some projects and the business inspection of subordinate institutions. Such as: the issuance of bank account opening license, the approval of loan card issuance, etc.