In　this　paper,　a　series　of　Al2O3/Ni　composites　with　various　content　of　Ni　(0　vol%,　10　vol%,　20　vol%,　30　vol%,　40　vol%　and　50　vol%)　were　prepared,　and　the　effect　of　the　methods　and　compositions　on　the　density　and　electromagnetic　properties　was　investigated.　The　results　show　that　the　density　of　the　composites　increases　with　the　increasing　sintering　temperature　as　well　as　the　increasing　content　of　Ni.　Moreover,　the　dielectric　constant　of　the　composites　increases　remarkably　with　the　sintering　temperature　and　the　content　of　Ni,　while　the　permeability　shows　an　almost　linear　enhancement　with　the　increase　of　Ni　content.　This　suggests　that　the　Al2O3/Ni　composite　can　be　expected　to　be　a　promising　substrate　material　with　certain　electromagnetic　compatibility.