Acid leaching residue of asbestos tailings was calcined at 600°C. N2 adsorption and desorption isotherms of this modified mineral material were measured at low temperature and the adsorption characteristic of acid leaching residue as well as the mechanism were discussed. The specific surface area of acid leaching residue was calculated by BET model, and meanwhile micropore and mesopore structural parameters were calculated by means of ‘t-Plot’ and BJH theory, respectively. The results showed that the N2 adsorption-desorption isotherms of acid leaching residue were in line withⅠpattern of the IUPAC isotherm criterions. The residue contained well-developed micropore and mesopore system. The adsorption performance of of Pb2+ in simulated wastewater for the acid leaching residue was also performed. The results indicated that a predominant chemisorption, which could be fitted by Langmuir isotherm, occurs on the materials.