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Spectral beam combining is an effective way to achieve high-brightness direct diode laser output.We present an experimental study on spectral beam combining with exteal cavity based on transmission grating.Using a series of cylindrical transform lenses with different focal lengths,spectral beaming combining efficiency is greatly improved,and the results of wavelength intervals are consistent with the theoretical calculations.With the injection current of 90 A,a 75.1 W cw 930nm output power with wavelength span of 18.6nm and spectral beam combining efficiency of 92.7％ is achieved,the beam parameter product is 5.77mm.mrad.