The solubility of H2S in aqueous solutions of 40 mass % MDEA + S mass % AMP, 30 mass % MDEA + 15 mass % AMP, and 22.5 mass % MDEA + 22.5 mass % AMP at (313.15, 333.15, and 353.15) K and pressure from the vapor pressure of the solutions up to 1.5 MPa using the isochoric saturation method were measured. The experimental data are presented as the partial pressure of H2S against acid gas loading (mole H2S/total moles of amine). The results showed that the H2S solubility decreases with an increase of temperature and increases with the rising of partial pressure of H2S, and also AMP concentration can improve absorption capacity of MDEA aqueous solution as [AMP](0)/[MDEA](0) (ratio of AMP per MDEA concentration in fresh solutions) increases when total amine concentration is constant. The Deshmukh-Mather model and Peng-Robinson equation of state were used for liquid and vapor phase, respectively, to correlate the solubility data.