A　system　for　testing　the　absorbing　capability　of　absorbing　materials　was　developed　in　this　paper.　Comparing　to　conventional　system,　the　system　presented　in　this　paper　has　variable　test　radius.　Because　of　the　variable　radius,　the　test　frequency　range　is　extended.　The　system　controls　the　instrument　to　connect　to　the　computer　by　programs　compiled　by　a　visual　compiler　which　is　based　on　the　Visual　Engineering　Environment　(VEE)　program　supported　by　Agilent　Company.　Furthermore,　with　space　plate　move　method,　the　error　of　the　test　system　due　to　the　mixed　coupling　between　antennas　is　adjusted.　The　arch　method　presented　in　this　paper　can　be　used　to　test　the　capacity　of　the　absorbing　materials　with　any　angle　of　incidence　affectively.　For　simplifying,　the　measure　results　of　the　reflectivity　of　some　absorbing　materials　when　the　angle　of　incidence　is　10　degrees,　20　degrees　and　30　degrees　are　given　in　this　paper.