In many-to-many radar countermeasure signal-level simulation system,the close coupling between the radars and the jammers often results in poor extensibility.A signal descriptor method is proposed to solve the problem.Firstly,the theory and method of digital simulation of coherent pulse train target echo are analyzed.On this basis,the simulation process of digital signal is decomposed,the components of signal descriptors are extracted,and then five kinds of signal descriptors are obtained,and how the signal descriptors adapt to the diversity of signal styles is discussed.Finally,the effectiveness of the method and its adaptability to many-to-many radar countermeasure signal-level simulation are verified via the simulation examples with two radars and two jammers.