A simple coprecipitation method has been performed to achieve a noncovalent modification of multiwalled carbon nanotubes (MWNTs) with polyhydroxyamide (PHA). The PHA-wrapped MWNTs (PHA-MWNT) prepared was verified by FT-IR and SEM. The weight content of nanotubes in PHA-MWNT is determined and analyzed by TGA. There are the strong interaction between PHA and MWNTs including hydrogen bonds besides pi-pi stacking and van der Waals interactions. Moreover, PHA-MWNT has a remarkable solubility in polar solvents and a good thermal stability.