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The temperature dependence of inteal friction (T- tan (ψ) curves) in pure aluminium (Al) is measured at sixteen different frequencies. Based on T - tan (ψ) curves, the frequency dependence of inteal friction (f - tan (ψ) curves)is also obtained by the interpolation method. An inteal friction peak is observed in both the T - tan (ψ) curves and the f - tan (ψ) curves. The activation energy of the peak in the f - tan (ψ) curves is found to be 2.08 ± 0.02 eV and compared to the value of 1.60 ± 0.04 e V in the T - tan (ψ) curves. It is suggested that the change of relaxation strength with temperature should be considered when one calculates the activation energy of the peak in T- tan (ψ)curves.