The implementation of performance management and appraisal system in any organization is to accomplish its strategic goals and objectives. The foundation of any organization is the performance management system (PMS). Organizations would not be able to survive if workers did not perform their assign duties. Organizations would be competitive and productivity would rise if workers gave their best effort. Performance appraisals (PA) are seen to be a useful Human Resource Management (HRM) tool that measures the standards that any organization or company sets for its workers by monitoring each worker’s performance in relation to the organization’s objectives. In Gombe State Treasury, staff evaluation performance is conducted manually which result to a lot of problems such as data inconsistency, inadequate storing of posting history, limited accessibility and flexibility among others. To address these issues online appraisal system was developed and implemented in the organization using water fall model as the adopted methodology and it is evaluated by distributing questionnaires to the staff and the management, analysis was carried out based on the defined hypothesis to see the impact of the system in the ministry which was found that the system has significant impact in conducting the appraisal exercise on both the staffs and the management as such it overcome the mentioned challenges faces during the exercise. The new system was designed to be more effective and productive for conducting staff appraisal exercise, eliminating all types of delay and tension. This research work made use of data collected from the organizations materials and journals from various authors and software was developed to effectively achieved aims of the research. The implementation of the system was carried out using PHP, JAVASCRIPT, CSS, APACHE and MYSQL for the database was carried out in the research. The system will automatically reduce the time and effort in the process. The system also evaluated by the staff of the organization and the data collected were analyzed and concluded that the system has significant impact in conducting the process based on the defined hypothesis.