According to the jamming principle and application method of laser decoy departure equipment, a hardware-in-the-loop (HWIL) simulation training system for laser decoy departure jamming is developed. The system is designed in conformity with the fundamental of “same principium and similar operation” firstly, and the key technologies are emphatically analyzed. Furthermore, the mode of operation and drilling is discussed based on the self-developed HWIL simulation training system. It is proved that the developed training system and contrived drilling means can simulate the whole process of laser decoy departure jamming, including threaten coming, task receiving and assignment, system spread and layout, cheating jamming countermeasure and equipments taking back. Consequently they can be used in essential operation and tactical drilling teaching for laser decoy departure jamming system.