||Due to excellent mechanical, electrical and thermal properties, boron nitride nanotube (BNNT) have been of interest for a wide range of potential applications such as materials for reinforcements, thermal insulation materials, piezoelectric materials, etc. In the previous study, we modified non-covalent functionalized BNNTs encapsulated by surfactants, which are dispersible in aqueous solution. Herein, for practical application of BNNTs, it is essential for the control of the morphologies of BNNTs, leading to the enhancement of their properties. Therefore, we have investigated self-assembly of BNNT-Pluronic polymer complex depending on the various interaction by using the small angle X-ray scattering (SAXS). In this presentation, we report the result of self-assembly of BNNT-Pluronic polymer complex depend on the hydrophobic interaction.