The effects of V 2 O 5 on the phase formation and dielectric properties of Bi 2 O 3 -ZnO-Nb 2 O 5 (BZN) pyrochlore ceramics were investigated. With the small amount of V 2 O 5 substitution (0.005=<x=<0.05), the sintering temperatures of Bi 1 . 5 Zn 0 . 5 (Zn 0 . 5 Nb 1 . 5 - x V x )O 7 can be effectively reduced from 1000 to 840 o C while the phase structures still kept to be the pure cubic pyrochlores. The V 2 O 5 seems to provide an eutectic melt below the sintering temperature to improve the sinterability. The dielectric constants decrease gradually with V 2 O 5 substitution while the temperature coefficients of the samples continuously increase. The dielectric loss are in same level as that of the basic composition at the smaller substitute amount (x=<0.02) but then degraded in lower frequency when the substitution reached to x=0.05. Obvious dispersion in the dielectric constant and loss was observed as a function of frequency and temperature after the substitution.