The study aims to examine the usefulness of accounting information system on effective organization performance in in Bahrain. The usefulness is examined by having two variables which are perceived usefulness, perceived easy to use. The study used a questionnaire to collect the date from listed organization in Bahrain that represented by having 133 employees. The study result revealed that a strong positive relationships between accounting information system, perceived usefulness, and perceived ease of use and effective organization performance in Bahrain.