Abstract: The basic principles of monobit EW receiver are introduced. The degree of realization difficulties are reduced by simplifying the DFT algorithm and employing low bit A/D. A series of problems for ultra wideband high speed sample are overcome by these methods. Window function's performances are analyzed, and the realization methods based on DSP are given. Monobit EW receiver test systems were built basing on these methods. Monobit receiver's false alarm probability, detection probability and double signal dynamic range are studied in detail and compared with DFT receiver. Compared with DFT receiver, the monobit EW receiver almost has the same properties except low double signal dynamic range. Its double signal dynamic range can be enhanced by increasing the input signal bit, for example, the dynamic range can be increased 5 dB by 2 bit A/D. The receiver's application prospects are analyzed at finally.