Abstract: A weighting orthogonal method for constant beamwidth beamforming matrces is proposed . This method multiplies weighting factors to each orthogonal beamforming matrix corresponding to different frequency components. The method proposed doesn't cause waveform aberration, and doesn't cause additional loss of array signal-to-noise ratio when the sources have uniform spectrum. So we can get good detection and estimation performances at the same time by the weighting method. Simulation results and water tank experiments are presented to confirm the conclusion above.