The hydrogen solubility and the thermodynamics of dissolved hydrogen in Ti0.45Fe0.45B0.1 were investigated in the ranges 0 less than or equal to P/bar less than or equal to 40 and 300 less than or equal to T/K less than or equal to 450 and compared with those in TiFe. The hydrogen intake capacity at any particular temperature and hydrogen equilibrium pressure is larger in the alpha phase of Ti0.45Fe0.45B0.1-H compared to that in TiFe-H and nearly the same in the beta phase. The plateau pressure in Ti-0.45 Fe0.45B0.1-H at any temperature is slightly higher than that in TiFe-H. The absolute values of the relative partial molar enthalpy and entropy of the dissolved hydrogen in Ti0.45Fe0.45B0.1-H are larger than those in TiFe-H. The exothermicity of hydrogen absorption decreases with the increase of hydrogen content in the a phase of Ti0.45Fe0.45B0.1-H and remains more or less constant in the alpha+beta phase.