In this work the synthesis of thenno-sensitive polymer coated magnetic nanoparticles and their inductive heating have been studied. Poly (N-isopropylacrylarnide-co-acrylic acid) (NA) polymers were first synthesized by emulsion polymerization of poly(N-isopropylacrylarnide) (NIP) in water and followed by encapsulating magnetic nanoparticles (MNPs). As increasing the concentration of acrylic acid (AA), the lower critical solution temperature (LCST) increased, so that with 150 percent of AA (molar ratio) the LCST reached 42°C, which is close to the temperature of hyperthermia treatment. Magnetization and ac susceptibility measurements were conducted to depict some characteristics of the NIP-MNPs and NA-MNPs that are related with the loss power. Attempts to analyze the rate of magnetic inductive heating were perfonned to show the Brownian relaxation origin of additional heat source created by the magnetite nanoparticles capped with thennosensitive polymers. the results suggest that these thenno-sensitive polymercoated magnetic nanoparticles show a potential for hyperthermia and drug delivery application.