The commercial banks have become a field of raising the interest of economy, the banks playa special role in the agency costs between borrowers and lenders, but banks have to minimize provide comparative advantage due to their superior ability to debt with inside information. Commercial banks play an important role in not only local but also in international business. Today, all major banks have branches in major cities around the world and they have color formed with banks in other countries to better serve international economy. The banks of a relationship of trust between the purchase and sale transactions in the international market to offer the indivisible services such as banking, currency, travelers checks, electronic transfer and Letter of Credit (LC), etc. One of the problems international business meeting of international business is the lack of confidence . With the help of financial device commercial banks for a relationship of trust between international buyers and sellers in the situation. In the commercial method, such as commercial collection and credit as an agent, the payment settled and appropriate document. Letter of Credit (LC) is most widely used method acceptable and to do international business, some banks and government agencies provide export credits, in such cases, banks provide export credit insurance. Foreign exchange market is another area where international commercial banks play important role. Foreign exchange market serves two main functions, convert the currency of one country to another, and provide some insurance against currency risks. Multinationals constantly different currencies for their operations needed. The international banks offer foreign exchange services for its business customers complete their business transactions banks act as intermediaries between foreign and domestic customers around the world. Many banks short-term and long-term loans provide finance to international business, many countries have formed banks supported by the government deliver the results, findings for exports and imports. banks, with international trade are among the crucial role they are required to play. Many large banks maintain worldwide to provide correspondent choose your bank for international trade based on weather Bank may advance to extend against the demand, Bank may, however, require about your account Export credit insurance secured. Let your bank in foreign exchange forward contract to give to your bank and the amount of foreign exchange reserves you get when you get when you are dealing in convertible currency. You need your bank with you as long as you are in international trade. In brief banks, a crucial role of catalysts play in international business by technological advances in the banking sector communication gap and delay in international business have a lot of really narrow.