Abstract: The (co-precipitation) method is used to prepare two types of ferrite (CoCoFe2O4 , ZnCoFe2O4 ). Precursor materials (ZnCl2 CoCl2 .6H2O), mixed with iron chloride (FeCl3). The prepared powder of ferrites were primary sintered at 800°C for 2 h XRD technique were used to study the structure of two types ferrite prepare. Then using these types of ferrite to prepare finely synthesis (ZnxCo1-xFe2O4) ) with (x = 0.2, 0.4, 0.6, 0.8) to be 8 samples halve of these were pressed as pellets (12.3 mm diameter, 5-4 mm thickness) then later halve as triodes (Rin = 9.85 mm, Rout = 19.4 mm) by hydraulic press at pressure (3-5 tons), all of them were sintered at in out (1100°C) for 2 h. Bulks densities were measured, DC measurements were used to determine electrical resistivity (p), AC measurements real part and of dielectric constant, initial permeability (εr’, μ ) were calculated, the study r i is show that, the x increase lead to decrease the density. Electrical resistivity has minimum value for x = 0.4. Real part of dielectric constant decrease sharply with increasing frequency to reach 100 kHz then the decrease is reducing.