A computerized corrosion database system for exposure tests has been designed and developed. This system was developed to help researchers carry out each experimental procedure in exposure tests. The system includes a function to manage not only the experimental data but also the timetable of exposure tests and the environmental factors of exposure sites. An easily used graphical user interface (GUI) and graph plot software are provided for users to help analyze exposure test results from various viewpoints. The data accumulated in this system are measurements of past exposure tests and exposure tests in progress. The analyses of past exposure tests using the present database system caused several ideas on atmospheric corrosion different from the conventional ideas on atmospheric corrosion. If the data of exposure tests in progress are compared with past data, the relationships between atmospheric corrosion and environmental factors will be more clarified.