The grating-external cavity spectral beam combined is based on the wavelength selection characteristic of the grating and the feedback by external cavity and simultaneously controls each emitter of the diode laser array (DLA) to lock at different wavelengths, while forces the individual beam to overlap in the near and far fields. The spectral combined beam has the same beam quality as the beam of single emitter of the DLA, greatly improve the beam quality of the output beam. The conventional CM-Bar with 19 emitters is applied, The period of the CM-Bar is 500 μm and the width of emitter is 100 μm . With the maximum continuous wave (CW) injection current of 70 A, a continuous 44.90 W laser output is obtained. The beam quality of slow and fast axes after spectral beam combined are 1.52 mm·mrad and 5 mm·mrad, respectively. Electro-optic conversion efficiency of 36% is achieved. The brightness of output spot is about 36.92 MW/cm2-str, spectral widening is 3.24 nm, combining output laser coupled into 50 μm core diameter, numerical aperture (NA) of 0.22 fiber, can be used as a high-brightness laser pump source or direct diode laser source.