The　Pb4Sb12-xBi8+xSe34　(x　=　0,　1,　2,　3,　4,　and　5)　crystals　belong　to　pavonite　homologues　composed　of　thick　NaCl-　and　thin　GeS-type　slabs　which　crystallize　in　the　C2/m　space　group.　Pb4Sb12-xBi8+xSe34　compounds　exhibit　n-type　semiconductor　transport　behavior　and　demonstrate　excellent　thermodynamic　stability.　These　intrinsic　compounds　have　high　carrier　concentrations　of　similar　to　2.18　x　10(19)　to　4.47　x　10(20)　cm(-3),　leading　to　high　electrical　conductivities.　The　two-band　electronic　structure　results　in　a　high　Seebeck　coefficient.　Taking　Pb4Sb9Bi11Se34　as　an　example,　it　has　a　remarkable　Seebeck　coefficient　of　-149.1　mu　V　K-1　and　high　electrical　conductivity　of　similar　to　118　S　cm(-1).　It　is　comparable　with　other　pavonite　at　723　K.　On　the　other　hand,　due　to　mixed　occupancies　of　cation　sites　and　complex　crystal　structure,　the　Pb4Sb9Bi11Se34　features　ultralow　lattice　thermal　conductivity　of　similar　to　0.25　W　m(-1)　K-1　at　723　K.　The　high　figure　of　merit,　ZT,　of　0.48　for　Pb4Sb9Bi11Se34　is　obtained　at　723　K.