Abstract: In this study, amino and mercapto functional groups were introduced to design the surface of covalent organic framework materials (COFs), and COFs were prepared and applied to adsorb mercury ions in water. It was characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscope, respectively. The concentration of mercury ions in aqueous solution after adsorption with COFs was measured by atomic fluorescence spectrometer, the experimental data were fitted by adsorption isotherm and kinetic model to explore the adsorption performance of the material under different conditions. According to the data, when the mercury ion concentration was 600 mg·L^-1, the adsorption amount reached the maximum of 587.6 mg·g^-1. The adsorption rate remains above 95% in the range of pH 1-10. The reaction can reach the adsorption equilibrium state within 1 min. In the solution with multiple ions coexisting, the adsorption rate of mercury ions can still reach to 66%. The study of adsorption process proved that the adsorption fit the pseudo-second-order kinetic model and Langmuir adsorption isotherm. It is a kind of easy reaction chemical adsorption. Therefore, COFs materials have good development potential in the field of adsorption and separation of heavy metal ions from water environment.