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The study of the structural, morphology and magnetic properties of Zn0.5Co0.5Fe2O4ferrite is the objective of this work. The sample was prepared by hydrothermal method and was characterized by X-ray diffraction (XRD), (SEM) and (TEM) micrographs and magnetization measurements. The magnetic hysteresis loops, field cooling (FC) and zero field cooling (ZFC) curves, in temperature range (0-400K), were measured using XL-SQUID magnetometer and the values of blocking temperatures (TB) were determined. The results indicated that Zn0.5Co0.5Fe2O4sample were formed in a single spinel phase and gives the value for the lattice parameter (8.3952 Å) and nanosizes of particles (13.8 nm) were compared with these obtained from ZnFe2O4sample prepared also by synthesis method (8.4261 Å and 14 nm). Although, the superparamagnetic behaviour for Co-Zn ferrite has observed at 350K with a blocking temperature (TB= 300K), that is maximum at the value obtained in the case of Zn-ferrite (TB= 12K). [ABSTRACT FROM AUTHOR]