For multi-channel problem of digital beam phased-array radar, multiplexing technology is proposed to achieve full digital array receiving multi-beam phased array radar. The antenna array is modulated by HF dual phase directly, the receiving multi-channel is simulated and synthesized into one channel for transmission processing. The base-band extracts echo signal data from each antenna unit and performs phase amplitude weighting, so as to achieve receiving digital multi-beam. This technology breaks though the receiving technology of single-channel digital beam phased array radar, which makes the volume of antenna greatly reduced, the radar system lightweight, low cost with flexible software configuration array, and improves the performance of radar, as well as reduces the complex level of modulation, test, technique and processing. It helps to improve the comprehensive performance of radar.