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The rehydration of several α-Al2O3 has been investigated by means of XRD,DTA, TG and nitrogen adsorption methods. It is found that all α-Al2O3 samples arecapable of rehydration at 250℃ and under saturated pressure. The rehydrated products depend on starting α-Al2O3. α-Al2O3 dehydrated at above 1000℃ rehydrates toboehmite, α-Al2O3 derived from diaspore at low temperatures rehydrates to diaspore.The quantitative analysis of the rehydration of α-Al2O3 has been studied.