Abstract: For the Mingantu interplanetary scintillation telescope of the Meridian II project, the digital beamforming technology is one of the key technologies. Since the present digital beamforming algorithms cannot match the requirements of the interplanetary scintillation telescope. In this paper, the existing digital beamforming algorithm-the Linear Constrained Minimum Variance (LCMV) algorithm is improved and optimized. The method of setting virtual interference is used to reduce the sidelobe of array pattern and the method of subarray is used to reduce the complexity of the algorithm. The improved LCMV algorithm is a digital beamforming algorithm suitable for Mingantu interplanetary scintillation telescope. The simulation results show that the algorithm can meet the needs of IPS telescope very well.Meanwhile, based on the single beam algorithm, an algorithm of multi-beamforming has also been proposed and discussed.