Improvement is made in the traditional spectral beam combining structure by adding beam shaping element, namely BTS. BTS is used to rotate the beam from the emitter in semiconductor laser array. The slow axis light distribution of each emitter becomes vertical distribution. The fast axis light distribution becomes horizontal distribution. Spectral beam combination is conducted by external cavity after beam shaping in horizontal direction. The effect of smile is reduced. As a result, the overall output beam quality and conversion efficiency is improved very much. A standard semiconductor laser array is used in this experiment. Output power of 70.01 W, electro-optic conversion efficiency of 52.8% and spectral beam combining efficiency of 92.2% are achieved. The spectral line-width is 7.7 nm. M2 of 1.28 (0.4 mm·mrad) in horizontal and 11.2 (3.5 mm·mrad) in vertical are obtained. The beam quality of the output is close to that of a single emitter of the array in both directions.