A　grating　and　a　collimating　lens　are　used　to　replace　the　transformer　lens　in　the　traditional　spectral　beam　combining　structure.　As　a　result,　the　degradation　of　the　beam　quality　and　the　cross-talk　are　prevented.　A　spectral　beam　combining　with　narrow　line-width　is　achieved.　A　standard　semiconductor　laser　array　is　employed　in　this　experiment.　An　output　power　of　44.8　W　and　an　electro-optic　conversion　efficiency　of　38.9%　are　achieved.　The　spectral　line-width　is　4.1　nm.　A　beam　quality　factor　of　1.37×11.7　in　fast　and　slow　axis　directions　are　obtained.　The　beam　quality　of　the　output　is　close　to　that　of　a　single　emitter　of　the　array　in　both　directions.　©,　2015,　Editorial　Office　of　High　Power　Laser　and　Particle　Beams.　All　right　reserved.