Abstract: Experimental study on weld-brazing of aluminum/steel dissimilar metal by fiber laser was carried out. The influences of wire feeding velocity on weld performance,intermetallic compounds thickness and mechanical properties were studied. The test results showed that high quality weld-brazed joints could be obtained by choosing the appropriate filler velocity. By using different melting points of aluminum and steel,the aluminum was just melted but the steel was not melted. The melted aluminum and the filler metal spread on the surface of steel,brazed weld was achieved. When the wire feeding velocity is less than 3. 5 m/min,it is easy to form hard and brittle intermetallic compounds and lead to weld cracking. The thickness of the intermetallic compounds should be controlled within a certain range to ensure joint quality. When the wire feeding velocity is 4. 5 m/min,the strength of the joint is improved,and the linear load can reach 203. 5 N/mm,which is about 83. 7%of that of aluminum alloy.