Abstract: Hydrogenation experiments that involved gas-solid hydrogenated method with a tube-hydrogen treatment furnace were conducted to investigate the change in hydrogen content of porous Ti-6A1-4V alloy with temperature, time and its relative density, and some corresponding mathematical models were proposed on the base of experimental data. It is shown that, for the porous titanium alloy with low relative density, the hydrogen content increases at a higher hydrogenation temperature; as for the porous titanium with high relative density, the relationship between hydrogen content and temperature obeys the Sievert's law, which is consistent with that of a compact titanium alloy. The hydrogen absorption capacity increases as the hydrogenation holding time prolongs, while it decreases as the relative density of the porous titanium alloy increases.