Abstract: A novel approach of deterministic blind beamforming (DBBF) for broadband nonstationary source separation is presented in this paper. Utilizing the nonstationarity of broadband sources, the conventional narrowband DBBF, based on rotational invariance techniques, is extended to the broadband case, and implemented in frequency domain. A channel rearranging operation, exploring the correlation coefficients between the separated sequences of adjacent bins, is performed to cope with the channel swap. Then the frequency consistency of the recovered sources can be ensured. In addition, the problem of scale ambiguity is eliminated and the original sources can be recovered without scale distortion. Numerical examples confirm the excellent performance of the proposed approach.