Abstract: First we analyze the requirements and characteristics of Electronics Warfare Receiver. The EW receiver must detect the signal in a wide frequency-band and wide spatial-direction. Secondly we suggest a method to realize the wide-width beam by phased antenna array sub-array division and synthesize technique. By using the wide-width beam we suggest a scheme to detect the frequency and direction separately in EW receiver. As a result the EW receiver can detect the targets more efficiently, and the EW receiver can also measure the direction and frequency more precisely.