Horseradish peroxidase was immobilized in chitosanhalloysite hybrid nanotubes with cross-linking by using glutaraldehyde. Structure analysis showed that the hybrid nanotubes formed three-dimensional nanocomposites 'with high porosity. With this new support material, the maximum enzyme loading reached 21.5 mg/g, which is higher than the capacity of raw halloysite (3.1 mg/g). Immobilized horseradish peroxidase did not have loss in activity after 35 days of storage, while free enzyme retained only 27 % of its original activity in the same storage conditions. The results showed that the immobilized horseradish represented high overall phenol removal from wastewater