Zeolites Y and the Y(m) modified by methyltrimethoxysilane were used for the hosts to prepare the Cd-Y and Cd-Y(m) samples by ion-exchange method and then the Y-CdS and Y(m)-CdS host-guest nanocomposite samples were prepared by a hydrothermal method by using thiacetamide as a sulfur source instead of toxic hydrogen sulfide. By mean of powder X-ray diffraction, chemical analysis, infrared spectroscopy, solid diffusion reflectance absorption spectroscopy, luminescence investigation, the prepared samples were characterized. The results of powder XRD analyses show that after the incorparation of CdS into the Y and Y(m) zeolites the frameworks of the prepared samples still exist and keep high ordered property. The IR results show that the formation of a new bond Si-O-Cd in Y-CdS and Y(m)-CdS samples. The results of solid diffusion reflectance absorption spectra show that there is no absorption from Y and Y(modified) zeolites, and there is not obvious difference for the absorption spectra between the Y-CdS and Y(m)-CdS samples. Luminescence studies show that for the Y-CdS and Y(m)-CdS samples there appear luminescence. The host-guest nanocomposite materials prepared have the potential ability as luminescent materials.