Abstract:A modified peanut shells as α-amylase immobilized on the enzymatic properties of the immobilized enzyme was detected， study the modified peanut shells fixed α-amylase adsorption optimal immobilization con－ ditions and immobilized enzyme enzymatic properties. The results showed that： enzyme immobilization devel oped optimal conditions were： enzyme / carrier 11 ∶ 1（mL/mg） buffer pH6.0， 8 h fixed time and Temperature 35 ℃. After three parallel experiments， the resulting immobilized enzyme actual average of 27 980 U/g. The free enzyme and immobilized enzymatic properties comparison， the immobilized enzyme modified optimum pH， temperature changes， as pH = 6.0， temperature was 45 ℃. At the same storage time， number of operations and the heat resistance was more than the free enzy.