A 3D-network Ni-Al（skeleton） reinforced aluminum alloy composites were designed and fabricated by vacuum suction casting combining vacuum heat treatment.The dry sliding wear behaviors of the composites prepared under various loads were examined.The results show that the wear resistance of composites is far superior to that of matrix alloys.It is supposed the network Ni2Al3（skeleton） intermetallic compound can be subjected to the load applied on the sliding surface as concave particles to restrain or delay the transformation of aluminum alloy from the mild wear to the severe wear.Meanwhile

it can uniformly transfer the load on the surface

inhibiting the loss of the aluminum alloy on wear surface from plastic deformation.The wear mechanism of matrix alloy is characterized by severe adhesive wear

and wear mechanism of the composites is mainly characterized by abrasive wear with slightly adhesion wear.