Abstract: In this paper,one general radar echo simulator based on DDWS technology is introduced.After the waveform data loading,the simulator can realize waveform data replay and generate variant waveforms.The control core is held by one FPGA and mega-byte FLASH is used as storage unit.The general interface,control logic reprogrammable and device coherent are specially designed.This simulator has tabloid general usage and sodality user's interface.At the end of this paper,one image about surface target and the chirp signal's compression result is presented.