Microwave　dielectric　ceramics　of　(1-x)Ba4Sm9.33Ti18O54　-xCa0.61Nd0.26TiO3[(1-x)BST-xCNT]　were　prepared　by　solid　state　reaction.　Effects　of　composition　and　sintering　temperature　on　their　crystal　structure　and　microwave　dielectric　properties　were　investigated.　A　single　new　tungsten　bronze　phase　was　observed　in　the　(1-x)BST-xCNT　ceramics　when　x　<　0.6.　A　secondary　phase　appeared　and　was　transformed　from　Sm2Ti2O7　to　a　perovskite　phase　when　x　≤　0.6;　and　a　single　perovskite　phase　was　formed　eventually.　The　dielectric　constant　e　increased　steadily　with　increasing　x-value,　but　the　quality　factor　Qf　value　increased　first,　and　decreased　rapidly　and　then　increased　sharply.　Optimal　dielectric　properties　were　obtained　for　the　samples　sintered　at　1325-1350°C:　ε=75,　Qf=8985　GHz,　temperature　coefficient　of　resonant　frequency　τf=-8.2　×　10-6/°C　for　x=0;　ε=75,　Qf=9　552　GHz,　τf=-14.4　×　10-6/°C　for　x=0.2;　ε=108.9,　Qf=14919　GHz,　τf=236.2　×　10-6/°C　for　x=1.