Abstract: Features of beamforming algorithms were analyzed. Considering blind beamforming algorithms without knowing the array manifold, direction of arrival, training sequence, the correlation matrix including noise and jamming and so on, a blind beamformer based on fourth-order cumulant was designed. Because of making directly use of high-order cumulant statistical information on received signals, both the interferences by Gauss noise and nonGauss noise can be eliminated effectively. The simulation test results show that this algorithm is more adaptable to multipath environment and has advantages of quicker convergence and better robustness to S/N change in comparison with MVDR beamformer.