A Systematic Analysis of Stellar Populations in the Host Galaxies of
  SDSS Type I QSOs
  We investigate the relationship between host galaxies' stellar content and
active galactic nuclei (AGN) for optically selected QSOs with z$<$0.5. There
are total 82 QSOs we select from Sloan Digital Sky Survey (SDSS) . These 82
QSOs both have Wide-field Infrared Survey Explorer (WISE) data and measurable
stellar content. With the help of the stellar population synthesis code
STARLIGHT, we determine the luminosity fraction of AGN ,stellar population ages
and star-formation history (SFH) of host galaxies. We find out there is a
correlation between the star formation history and AGN property which suggests
a possible delay from star formation to AGN. This probably indicates that the
AGN activity correlate with the star formation activity which consistent with a
co-evolution scheme for black hole and host galaxies.
