Conductive　silicone　rubbers　filled　with　the　spherical,　flaky,　and　chain-spherical　carbonyl　nickel　powder　were　prepared.　The　effects　of　powder　morphologies　on　their　electromagnetic　and　mechanical　properties　were　analyzed.　The　electromagnetic　shielding　effectiveness　(SE)　and　tensile　strength　of　the　rubbers　varies　with　their　powder　morphologies:　the　SE　values　increase　from　the　spherical　and　the　chain-spherical　to　the　flaky　morphology　in　the　frequency　range　of　100-400　MHz.　In　the　range　of　500-1500　MHz,　the　SE　rises　from　the　spherical　and　the　flaky　to　the　chain-spherical　morphologies.　In　addition,　the　tensile　strength　increases　from　the　spherical　and　the　flaky　to　the　chain-spherical　morphologies.　These　variations　are　related　to　the　differences　in　the　conductive　network　structure　and　the　powder　distribution　in　the　rubber.