Multiferroic nanocomposite films composed of P͑VDF-TrFE͒ copolymer and CoFe 2 O 4 ͑CFO͒ nanoparticles have been prepared by a modified polymeric processing. Structural characterizations reveal that CFO nanoparticles with 80-100 nm diameters are well distributed in the P͑VDF-TrFE͒ matrix. The crystalline and microstructure of P͑VDF-TrFE͒ are strongly dependent on the volume fraction of CFO nanoparticles, which are further analyzed by Raman spectra. Consequently, the ferroelectric and magnetoelectric responses are strongly influenced by the concentration of CFO nanoparticles. A significant magnetoelectric coupling effect of around 40 mV/ cm Oe is obtained from the nanocomposites. A relatively simple model has been adopted to calculate the magnetoelectric coefficient, which is also in agreement with the experimental results.