In this world of competitive resource application and technological development, the banks have been totally computerized. This project work Design and Implementation of computerized banking system is concerned with the analysis and design of a computerized system aimed at supporting the whole banking operation provides an interface which enables the user or the customer to lodge in money into his or her account and make withdrawals as the need arises. It will also provide the basis for the implementation of computerized banking transactions. A development which made most banks and other financial institutions more responsive to changes and imperative to adopt the latest art of technology is for the purpose of maintaining operational efficiency as a means of warding off competitive threat, and also to improve on the security measures, checkmate fraud and error, to increase the speed of transaction and improvement of customer’s convenience by reducing barriers to entry into payment systems. At the end of all, the system proposed is better, calculates faster and is reliable. This enhances operations and level of commitment to customers.