This paper briefly introduces the characteristics and test status of active decoy system, as well as decoying efficiency test requirements. The main problems of test pattern of active decoy hardware-in-the-loop simulation are discussed based on existing simulation resource extension. On the basis of the design idea of the overall process closed-loop countermeasure and situation simulation using real active decoy system and anti-radiation missiles, the active decoy hardware-in-the-loop simulation test pattern is established.