A modified Monte Carlo (MC) simulation was performed to investigate the hydrogen absorption behavior in Pd and Pd-Ag alloys of the composition PdxAgl-x (x = 0.7-0.8) under H-2 pressure (0.1 MPa) at different temperatures. The present method employed can consider the dissociative adsorption of hydrogen molecule and the subsequent absorption of hydrogen atom by formalizing the relationship between the pressure of hydrogen molecule and hydrogen atom. The potential parameters were determined to reproduce the solution enthalpy of hydrogen in pure metals. The results are in good agreement with experimental findings as well as previous theoretical studies. We confirmed that our method is useful to simulate the absorption of hydrogen in metals and alloys. (C) 2003 Elsevier B.V. All rights reserved.