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In this study, water pollution contamination can be eliminated by the AOPs (Advanced Oxidation Processes) method, the photodegradation method that uses photocatalyst techniques made from semiconductor materials such as ZnO which have the advantage of not being easily degraded when light absorption, non-toxic, and environmentally friendly. However, this material is not magnetic so it is difficult for this material to be separated from the solution after being used even though ZnO has the potential to be applied repeatedly. To determine the effect of ZnO concentration on the crystal structure and the magnetization properties of Fe3O4@ZnO Core-Shell Nanoparticles, the fabrication of Fe3O4@ZnO Core-Shell nanoparticles with variations of ZnO concentration had been successfully synthesized by using precipitation method. To investigate the structural, morphological, magnetization properties, and optic properties of Fe3O4@ZnO Core-Shell Nanoparticles, the samples had been characterized by using XRD, TEM, VSM and UV-Vis Spectrophotometers respectively. The results showed that ZnO concentration did not affect the crystal structure. Furthermore, TEM image showed that the core-shell structure was well carried out. The addition of ZnO concentration can affect particle size and can reduce the magnetization properties of Fe3O4 nanoparticles, and can increase the degradation rate of methylene orange dyes.