Wide-band signal processing is one of the topics in electronic warfare. In contrast to narrowband signal processing, wideband signal processing can result in the worsening of digital range，sensitivity and multiple signals processing，etc. To tackle these problems，this paper introduces some modern advanced electron technologies，including wideband sampling，array processing，digital channelizing，and jamming based on the digital radio frequency memory etc. in wideband digital signal processing，and analyses the effects of bandwidth on these technologies. It discusses the applications and the development trends of the technologies in electronic warfare. It is expected that the topic could provide useful reference for engineers engaging in the digital signal processing.