The Web-based Attendance Management System is a manageable system for personnel department which is designed for collecting employees' attendance timestamps and provides online application forms for employee to apply for leaving and absence. Each level's managers can also permit or reject the employees' requested forms and get their attendance reports by using a browser. The personnel department also can audit and manage all of the employees' attendances via this system. This system is going to replace the manual process of personnel department's jobs such as generating many kinds of statistic reports. In addition, the payment for working over time and the business traffic fee can be transferred directly into employee's individual bank account by this system. This system is an efficient tool and will improve the office automation for personnel management. This paper is proposed to give a brief introduction to this system. Mainly, it can be divided into 6 sections: introduction, system structures, operations, functions, design, and the state-of-the-art.