Novel　high　quality　factor　microwave　dielectric　ceramics　(1-x)ZrTiO4-x(Mg1/3Nb2/3)TiO4　(0.325x0.4)　and　(ZrTi)(1-y)(Mg1/3Nb2/3)(y)O-4　(0.2y0.5)　with　the　addition　of　0.5wt%　MnCO3　in　the　(Mg1/3Nb2/3)O-2-ZrO2-TiO2　ternary　system　were　prepared,　using　solid-state　reaction　method.　The　relationship　between　the　structure　and　microwave　dielectric　properties　of　the　ceramics　was　studied.　The　XRD　patterns　of　the　sintered　samples　reveal　the　main　phase　belonged　to　-PbO2-type　structure.　Raman　spectroscopy　and　infrared　reflectivity　(IR)　spectra　were　employed　to　evaluate　phonon　modes　of　ceramics.　The　0.65ZrTiO(4)-0.35(Mg1/3Nb2/3)TiO4-0.5wt%　MnCO3　ceramic　can　be　well　densified　at　1240　degrees　C　for　2hours　and　exhibits　good　microwave　dielectric　properties　with　a　relative　permittivity　(epsilon(r))　of　42.5,　a　quality　factor　(Qxf)　value　of　43520GHz　(at　5.9Ghz)　and　temperature　coefficient　of　resonant　frequency　((f))　value　of　-5ppm/degrees　C.　Furthermore,　the　(ZrTi)(0.7)(Mg1/3Nb2/3)(0.3)O-4-0.5wt%　MnCO3　ceramic　sintered　at　1260　degrees　C　for　2hours　possesses　a　epsilon(r)　of　31.8,　a　Qxf　value　of　35640GHz　(at　6.3GHz)　and　a　near　zero　(f)　value　of　-5.9ppm/degrees　C.　The　results　demonstrated　that　the　(Mg1/3Nb2/3)O-2-ZrO2-TiO2　ternary　system　with　excellent　properties　was　a　promising　material　for　microwave　electronic　device　applications.