Abstract: For the phased array radar system at subarray level employing monopulse technique, it requires to suppress sidelobe of sum beam and different beam simultaneously. This paper investigates the approach which only applies one kind of analog weighting at element level combined with the digital weighting at subarray level to suppress sidelobe of sum and different beam. At first constructing sum channel and difference channel, then making optimum adaptive filtering for the supposed jammer within the whole sidelobe area of sum and difference beam, the desired analog weight is determined. In order to further improve sidelobe suppression effect, the digital weighting at subarray level is then adopted, which approximates to the conventional Taylor and Bayliss weight respectively. This approach reduces the hardware cost and complexity effectively, and makes full use of the flexibility of digital processing. Simulation results demonstrate the validity of the introduced approach.