Abstract: Pyrochlore ceramics with formula （Bi_1.5Sr_0.5）（M_1.5Nb_0.5）O₇（BSMN,M=Sn⁴⁺、Zr⁴⁺） were prepared by the traditional solid-state reaction method and systematically investigated. X-ray diffraction （XRD）revealed that pure cubic pyrochlore structure were formed for both samples. New high frequency dielectrics, differed by tetravalent cations, with temperature compensation and controllable permittivity of 56-76 have been developed. Introducing of Sn and Zr cations lead to large differences in permittivity and temperature coefficient of permittivity. Comparing to BSSN, BSZN has the larger temperature coefficient of permittivity at 1MHz. For the cubic pyrochlore structure, dielectrics with high permittivity are based on structures with BO6-octahedra joined one to another by their tops. The relationships among composition, phase structure and properties were discussed further.