  High-resolution optical spectroscopy was conducted for the metal-poor
post-AGB star CC Lyr to determine its chemical abundances and spectral line
profiles. Our standard abundance analysis confirms its extremely low
metallicity ([Fe/H]<-3.5) and a clear correlation between abundance ratios and
the condensation temperature for 11 elements, indicating that dust depletion is
the cause of the abundance anomaly of this object. The very low abundances of
Sr and Ba, which are detected for the first time for this object, suggest that
heavy neutron-capture elements are not significantly enhanced in this object by
the s-process during its evolution through AGB phase. Radial velocity of this
object and profiles of some atomic absorption lines show variations depending
on pulsation phases, which could be formed by dynamics of the atmosphere rather
than by binarity or contributions of circumstellar absorption. On the other
hand, the H-alpha emission with double peaks shows no evident velocity shift,
suggesting that the emission is originating from the circumstellar matter,
presumably the rotating disk around the object.
