We have demonstrated that the functions of focusing and collimation of the transformer lens in the traditional spectral beam combining systems can be achieved by two optical lense s.One lens focuses all the beams from all emitters on the grating,which makes beams superimposed in space,while t he other lens collimates the combining beam after the grating,to ensure a sufficient amount of feedback and make each emitter locked at different wavelengths.The first lens used for focusing doesn′t need to collima te the beams from all emitters,so the distance between the focusing lens and the front face of diode laser bar is no longer the focal length of the transformer lens and can be very short.So the optical path of the system is red uced by half approximately,which makes it convenient for spectral beam combining of multiple bars.A standard semiconductor laser array is employed in this experiment.Output power of 49.42W and electro-optic conversi on efficiency of 42.7% are achieved.The spectral line-width is 8.5nm.M²_x val ues of 1.29and 11.6in horizontal and vertical directions are obtained. The beam quality of the output is close to that of a single emitter of the array in both directions.