Objective To establish a rapid method for extracting genomic DNA(gDNA) from various samples by using the adsorbent material NZVI-GO prepared by combining graphene oxide(GO) with epoxy functional groups and nanoscale zerovalent iron(NZVI), so as to meet the requirements of subsequent molecular experiments.Methods Magetic nanomaterial NZVI-GO was prepared via hydrothermal method and characterized. NZVI-GO was then used to extract gDNA from various biological samples(blood, bacteria, animal and plant tissues). During the gDNA extraction process, the quantities of magnetic nanomaterials(human whole blood and Yersinia pseudotuberculosis: 10, 15, 20 and 25 mg; animal and plant: 20, 35, 50, 65 and 80 mg), SDS buffer concentration(2%, 4%, 6%, 8% and 10%), TC buffer pH(2, 4, 6, 8 and 10) and polyethylene glycol6000 concentration(5%, 10%, 20%, 30% and 40%) were optimized. The gDNA of four biological samples was extracted by the established method, and compared with the nucleic avid extraction kits produced by two manufacturers.Results Fourier transform infrared(FTIR) spectroscopy analysis was performed on GO particles, NZVI particles, and NZVI-GO, revealing the presence of interactions between NZVI and GO. Subsequently, scanning electron microscopy(SEM) observations showed that GO acted as a dispersant, embedding the nano-iron particles uniformly. The spherical structure formed by GO and NZVI protected the hydroxyl and carboxyl functional groups on the NZVI surface from oxidation. The optimal extraction conditions were as follows: 20 mg of magnetic beads, 6% of SDS, pH 10 and 20% of polyethylene glycol 6000. Compared with the commercially available nucleic acid extraction kit 1, the gDNA concentration of human whole blood, bacteria, animal and plant samples extracted by NZVI-GO method increased, but the difference was not statistically significant(t = 1. 236-1. 935,each P > 0. 05). Compared with the commercial nucleic acid extraction kit 2, the gDNA concentration extracted by NZVI-GO was all significantly higher, with statistically significant difference(t = 4. 568-15. 200, each P < 0. 01).Conclusion The established gDNA extraction method based on NZVI-GO has the advantages of simple and rapid operation, high efficiency,and broad-spectrum applicability, which can meet the requirements of subsequent molecular experiments.