Q-CdS nanoparticles(d<10 nm) were prepared by synthetic methods of coordination chemistry Then a seNes of Q-CdS/polymer nanaocomposite films were successfully prepared by mixing Q-CdS with polymers．Their size quantization effect and dispersion were observed in UV-Vis spectra and TEM image．Fluorescent properties of nanocomposite films of different kind polymers or different Q-CdS contents

were studied by fluorescent spectra．Compared to CdS nanoparticles or pure polymers

nanoeomposite films which were made of polymer and Q-CdS have special fluorescence spectra due to interaction between them．The fluorescence intensity of nanocomposite films increased with the Q-CdS nanoparticle content

showing a maximum at the ratio Q-CdS/Polymer=0.067/1 by wt.