Abstract: The automatic test system of DCS industrial control card is designed to realize the automatic test task of DCS industrial control card and ensure that the hardware and function of the card is stable and reliable. The system hardware uses standard 4U chassis and other accessories, and adopts embedded design and modular installation. The software based on the embedded Linux system, it adopts the design method of multi-process and multi-task. The software and hardware cooperate together to realize the highly automatic test of DCS card. The system has been tested and verified, and now it runs stably on the production line. It automatically tests the produced cards, which greatly improves the production efficiency and quality of the cards.