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(Pb0.4Ca0.6)(Fe1/2Nb1/2)O3 system was modified by 10 mol% Pb(Zn1/2W1/2)O3 addition and their sinterability and microwave properties were investigated as a function of the amount of flux (0.975PbO-0.025SnO2). With increasing flux content, single perovskite phase was maintained up to 3 wt% flux addition and further addition led to the presence of Pb-rich second phase which was confirmed by EDS analysis. The apparent densities of PCFN-PZW specimen increased and showed maximum values at 2.5 wt% flux addition for the Ts=1000oC and 2.0wt% flux addition for the Ts=1050oC, respectively. The dielectric constant and Q․f values strongly depended on the variation of density and microstructure, where the optimum values of εr = 91.95, Q․f = 5938GHz, TCF = +8.15ppm/℃ were obtained for the 2.5wt% flux added PCFN-PZW specimen sintered at 1000oC for 4h.