Abstract: The characteristics of the multi-targets'spatial spectrum in acoustic field is analyzed in the paper, and the adaptive weight suitable to this condition is derived.Two null-steering matrixes for odd and even arrays to get reference signal are presented, and verified by formula deduction and simulation.In comparison with CBF this method can get lower sidelobe and narrower mainlobe.Its response to reverberation is studied by experimental data.And the result shows that it does get lower sidelobe and narrower mainlobe compared with CBF.And the detection ability is improved.