According to the classification of banks, county and city sub-branches belong to secondary sub-branches, which are mainly responsible for the issuance, recovery, counting and identification of physical currency, as well as the settlement and sale of foreign exchange and cooperation with international financial organizations.

County and city sub-branches play a vital role in the construction of new countryside. They are the coordinators of local governments, the transmitters of monetary and credit policies, and the defenders of financial management within their respective jurisdictions.