Abstract: A new method of direction of arrival(DOA) estimation of wide-band sources by coherent signal-subspace focusing to frequency-dependent modeling (CSSFDM) is proposed. The coherent signal-subspace(CSS)² was proposed by H.Wang and M.Kaveh in 1985. Its key point is the focusing which maps the signal subspaces of the narrowband components of the wide band sources onto a single signal subspace. Y.Grenier set up the frequency-dependent modeling(FDM)¹³ of array signals by introducing the basic function into array signals to process directly the wide band signals in 1994. We present a new DOA estimation method that combines the coherent signal-subspace focusing and the frequency-dependent modeling, and construct its diagonal focusing matrix. Because of extending the order of correlation matrix of array signals and presenting effectively noise subspace by FDM, the method shows the better performance than CSS. By means of the focusing of CSS, it reduces obviously computational complexity of the spatial spectrum of FDM. The effectiveness of the new method is confirmed by computer simulation.