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The development of new and stable gene carrier is of great importance to improve the transfection efficiency and achieve to certain fundamental needs in gene therapy such as therapeutic protein formation, immunogenicity enhancement and apoptosis induction. The stability and applicability of the system that contains single-walled carbon nanotubes (SWNCTs) to combine with plasmid DNA (EGFp-C1) was examine by computer simulation. Raman spectroscopy was used as supporting information to verify the process and phenomenon of complex formation. Two diamine biomolecules, 1,4-diaminobutane and polyoxyethylene bis-amine, were applied in order to load positive charges onto the surface of SWCNTs under physiology condition and also enhance the biocompatibility of SWCNTs. The formation of peptide bond was examined with FTIR spectroscopy to confirm the result of cross liking. Concentration of surface functional groups was examined with TGA, which found that they are at an extremely low concentration but show great influence on the physical property. The binding efficiency of functionalized SWCNTs to EGFp-C1 was analyzed through the binding strength under electrophoresis. Cytotoxicity and cell viability were evaluated with LDH and MTT assay that show a significant increase in cell viability for SWCNTs-1,4-diaminobuatne complex. The inflammatory inducing property were assessed by pro-inflammatory factor IL-6 release by using quantitative sandwich enzyme immunoassay technique.