In this study, the development of vacuum seeding system for plug seedling production is the most important achievement. This seeding system includes medium supply equipment, automatic tray stacker and destacker, and vacuum seeder with vibrating seed feeder. The miss seeding rate is 0.4% for cauliflower, and 3.1% for watermelon at the capacity of 240 plug trays per hour. The seeding speed per labor-hour is 16 times faster than human labor. This seeding system was also an exhibition item in Automation Show at Taipei World Trade Center in July 1992. Four demonstration centers for automatic vegetable seedling production, where the integrated vacuum seeding systems are being operated, were established. Twenty million plug seedlings are expected to be produced per year. The computer program written for the management of seedling production centers was completed.