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The magnetic Fe3O4@C@TiO2 microspheres with multilevel yolk-shell structure were successfully prepared by combining sol-gel and simple hydrothermal methods.The features of the as-obtained Fe3O4@C@TiO2 microspheres were investigated by Fourier transform infrared(FTIR)spectra,scanning electron microscopy(SEM),powder X-ray diffraction(XRD),N2 adsorption-desorption measurements and transmission electron microscopy(TEM).Fe3O4@C@TiO2 was used as an adsorbent to explore its adsorption properties of oxytetra-cycline hydrochloride(OTC-HCl)by changing initial concentration and time.The results suggest that the max-imum adsorption of Fe3O4@C@TiO2 is 87.3 mg·g-1,and the time reaching the absorption equilibrium is 60 min.Langmuir model fits to data better than the Freundlich model,and the kinetic properties are well described by the pseudo-second-order model.In addition,the synthesized composites'reusability without obvious deterioration in performance is demonstrated by three cycles.