Abstract: An approach of wideband beamforming to achieve accurate beam direction was pursued by the designers of the wideband digital array radar. According to the characteristics of the wideband digital array radar sampling in the Radio Frequency(RF) part, a real time and efficient digital time delay beam forming method based on the Variable Fractional Delay (VFD) filter is presented. The method proposes that the VFD filter can be integrated with the decimation anti-aliasing filter to design a dual-purpose filter and reduce the processing modules, and the polyphase structure is combined with the Farrow Structure to configure the key filter proposed above. This approach can realize the decimation and variable fractional delay in real time and achieve the accurate beam direction, which isn't affected when the signal frequency varies. The computer simulation result shows that, compared with unit delay beamforming approach, this optimized approach can improve the beam pointing accuracy effectively.