Digital beam forming technology is a key in the field of communication countermeasures. By controlling the signal amplitude and phase in the digital domain, multiple independent and controllable beams can be formed, with high precision and flexibility in beam pointing, and theoretically not limited by the number of beam forming. The article focuses on the requirements of large phased arrays, utilizes the principle of digital beam forming, and combines large-scale arrays signal synchronization technology and phased arrays amplitude-phase calibration technique, implements a multi-wave position beam search system that can simultaneously generate 180 biased beams. It can utilize the real-time scanning function of the beam group to achieve large-scale beam search and faster target angle positioning. The system has been applied in engineering and successfully executed a large-scale measurement and control task, achieves complete success.