  We present a comprehensive study of Ultraluminous Infrared Galaxies (ULIRGs),
leveraging data from the IRAS Faint Source Catalogue (FSC) and the
spectroscopic catalog in the Sloan Digital Sky Survey (SDSS) DR16. Our
meticulous cross-matching technique significantly enhances the reliability of
ULIRG identification, resulting in the identification of 283 reliable ULIRGs,
including 102 new detections, while discarding 120 previously reported false
sources. Covering a redshift range of $z = 0.018 - 0.996$, with a median
redshift of $\bar{z} = 0.259$, our uniform sample reveals apparent interaction
features in approximately 40\% of ULIRGs, increasing to 92\% for those with $z
< 0.1$. Through optical spectra analysis, it is indicated that over 58\% of
ULIRGs host an AGN, which is twice as high as the detections based solely on
infrared colors. Moreover, a pronounced excess of radio emissions associated
with AGN activity results in a steeper radio-far-infrared correlation. Notably,
Type I ULIRGs exhibit properties similar to those of narrow-line Seyfert 1
galaxies (NLS1s), with an elevated incidence rate of \ion{Mg}{2} BALs (16.7\%),
surpassing that of typical optically selected quasars by over tenfold,
consistent with current evolutionary models. We anticipate that forthcoming
telescopes such as the China Space Station Telescope (CSST) and Leighton
Chajnantor Telescope (LCT) will provide deeper insights into ULIRG morphology,
dust distribution, molecular gas, and AGN activity.
