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In order to improve the monitoring efficiency of IRIG-B code signal, a set of automatic monitoring system is needed. Aimed at the general IRIG-B (DC) format time code output from a certain model timing system, this article introduces the design process of the portable IRIG-B(DC) signal monitoring system, and puts forward the system design frame centered with Arduino of “input control+ logical control+ data processing+ data interactive+ data storage+ net transferring+ real-time displaying”. The system using the technology of highly integrated AVR second compiling packaging library embedded in Arduino, which makes low-level instructors including complicated logical control and data processing be packaged in simple function callings. It accomplishes the function of IRIG-B(DC) signal’s real-time acquisition、analysis and time decoding、status monitoring and data storage. Tests show that system works stably and is designed simple, satisfies the requirement.