Abstract: Bi_1.5ZnNb_1.5-xTi_xO₇(0≤x≤0.2, BZNT) ceramics was prepared by a solid phase reaction.The effect of Ti⁴⁺ substituting Nb⁵⁺ on the microstructure, dielectric and crystal chemistry properties of Bi_1.5ZnNb_1.5O₇ based ceramics was investigated.The results revealed that when x≤0.15mol, crystal structure of Bi_1.5ZnNb_1.5-xTi_xO₇ ceramics via X-ray diffraction(XRD) was pure α BZN phase.And all the compositions exhibited an optimal sintering property at 960oC.With the increase in the amount of Ti⁴⁺ ion, lattice constant gradually decreased.For crystal chemistry parameters, with the increase in the amount of Ti⁴⁺ ion, AV(O') Bi₄, AV(O') Bi₃Zn, AV(O') Bi₂Zn₂, AV(O') Ti₃Znall gradually increased, which coincided with the changes of lattice constant and dielectric properties.