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A measurement scheme for detecting the α relaxation time (τ) of glass-forming liquid is proposed,which is based on the measured ionic conductivity of the liquid doped with probing ions by low-and middle-frequency dielectric spectroscopy and according to the Nemst-Einstein,Stokes-Einstein,and Maxwell equations.The obtained τ values of glycerol andpropylene carbonate by the scheme are consistent with those obtained by traditional dielectric spectroscopy,which confirms its reliability and accuracy.Moreover,the τ of 1,2-propanediol in a larger temperature range is compared with existing data.