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The (1-x)Ba(Zr0.2Ti0.8)O3-xKNbO3 samples were synthesized by solid state reaction method. The samples were investigating on the crystalline structure, dielectric and ferroelectric properties. XRD pattern were exhibited the microstructure and tetragonal phase for all samples with sintering temperature at 1200 ºC. The results that should 0.2KNbO3 was obtained coexists between tetragonal to cubic phases. The dielectric constant obviously was increased from adding 0.3KNbO3, while the dielectric loss slightly decreases. The P-E loops of sample ceramic showed the ferroelectric behavior, as well as normally ferroelectric and relaxor ferroelectric. In addition, the good ferroelectric properties exhibited Ec = 7.24 kV/cm, Pr = 13.38 µC/cm2 for 0.5KNbO3, which it originated to the contributions of the perovskite structure (tetragonal phase).