This paper describes an implementation method of digital array radar signal simulation system, which has the capability of generating and real-time output of analog data of digital array radar echo signal (target, jamming, clutter, etc.). Through the modeling of various target, jamming and clutter models, the principle and implementation method of digital array radar signal simulation system are described, and the hardware implementation scheme is given. The system can adapt to the simulation of digital array radars of different frequency bands and array sizes through the adjustment of various radar parameters and the expansion of hardware scale.