The present invention relates to an alarm engineering aiding system for aiding engineering of an alarm generated in a plant. There are provided an alarm generating scenario file in which types of pseudo alarms and generation timings are defined, a plant instrumentation information DB for storing instrumentation information of the plant, and a pseudo alarm generating section for generating the pseudo alarm based on the alarm generating scenario file, and adding instrumentation information of the plant while referring to the plant instrumentation information DB when the pseudo alarm is generated.