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Absolute optical oscillator strength density (OOSD) spectrum of HCl in the valence shell energy region of 5.5-20 eV has been determined by the high resolution fast electron energy loss spectrometer (EELS). The optical oscillator strengths for the broad A1Ⅱ + 13∑+ dissociation peak and the discrete transitions of b3Ⅱ(v′=0),C1Ⅱ(v′ = 0, 1, 2) and M1Ⅱ(v′= 0) are reported.