Manganese　zinc　ferrite/barium　ferrite　composite　materials　were　prepared　with　various　content　of　Z　type　barium　ferrite　(0,　10,　20　wt　%)　using　solid　state　reaction　method.　The　effect　of　the　composition　on　the　microstructure　and　electromagnetic　properties　of　the　composites　are　investigated　by　means　of　X-ray　diffraction,　scanning　electron　microscope　and　impedance　analyzer.　The　X-ray　diffraction　patterns　reveal　that　W　phase　barium　ferrite　instead　of　Z　phase　appears　in　the　sintered　composite　as　well　as　the　spinel　phase.　Some　small　hexagonal　grains　were　observed　in　the　SEM　images　and　the　proportion　increases　with　increasing　content　of　barium　ferrite.　The　cut-off　frequencies　of　the　composite　systematically　shift　towards　high　frequency　from　2.5　MHz　to　32.6　MHz,　which　is　attributed　to　the　increase　of　W　phase.　The　composites　show　an　increasing　frequency　at　which　the　maximum　of　the　impedance　appears　as　well　as　a　higher　value　of　the　impedance　at　high　frequency,　which　may　be　benefit　for　the　application　at　GHz　frequency　range.