Halloysite is modified with 3-aminopropyltriethoxysilane in various solvents without pretreatment. According to elemental analysis, FTIR spectroscopy, and thermogravimetry, the reaction between 3-aminopropyltriethoxysilane and halloysite successfully proceeds regardless of the nature of the solvent. The maximum degree of functionalization of interaction products is achieved at the equimolar silane : halloysite ratio; as this value is increased, the degree of functionalization decreases. The magnitude of the degree of hydrolysis changes symbatically with the degree of functionalization.