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Objective: To synthesize cisplatin loaded and cell penetrating peptide TAT decorated magnetic nanoparticles and to observe the inhibiting effect in vitro on nasopharyngeal cancer therapy. Method： The aldehyde sodium alginate coated magnetic nanoparticles (ASA-MNPs) was prepared as the drug delivery system, which was covalently attached by PEGylation TAT (TAT-ASA-MNPs) via condensation of aldehyde with amino group and then coordinated with cisplatin (TAT-ASA-MNPs@CDDP). The complex was characterized by H-NMR and FT-IR. The cell penetrating ability and biocompatibility were observed by means of fluorescent tags. The inhibited effect on nasopharyngeal cancer CNE-2 cells was measured by cellular toxicity research and flow cytometry. Result： The H NMR and FT-IR of TAT-ASA-MNPs exhibited the characteristic peaks of TAT, PEG as well as ASA. The dynamic light scattering showed the hydrodynamic diameter of the complex was（145.9±1.5）nm. Zeta potential was（-21.66±1.24）mV and the drug loading rate was（25.03±3.05）%. Fluorescent labeling assay revealed that FITC marked TATASAMNPs was quickly taken up by CNE-2 cells. Cytotoxicity experiment on 293T cells displayed high survival rate (>70%) after cultured for 72h. Negative hemagglutination reflected decent biocompatibility. In vitro cytotoxicity test and cell apoptosis assay exhibited obvious inhibition on CNE-2 cell with TATASAMNPs@CDDP at low concentration of cisplatin compared to ASA-MNPs@CDDP ( P <0.05). Conclusion： TAT-ASA-MNPs showed decent biocompatibility while distinctly inhibit CNE-2 cells in vitro study., Competing Interests: The authors of this article and the planning committee members and staff have no relevant financial relationships with commercial interests to disclose., (Copyright© by the Editorial Department of Journal of Clinical Otorhinolaryngology Head and Neck Surgery.)