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The South Galactic Cap $u$-band Sky Survey (SCUSS) provides a deep $u$-bandimaging of about 5000 deg$^2$ in south Galactic cap. It is about 1.5 mag deeperthan the SDSS $u$-band. In this paper we evaluate the capability of quasarselection using both SCUSS and SDSS data, based on considerations of the deepSCUSS $u$-band imaging and two-epoch $u$-band variability. We find that thecombination of the SCUSS $u$-band and the SDSS $griz$ band allows us to selectmore faint quasars and more quasars at redshift around 2.2 than the selectiononly with the SDSS $ugriz$ data. Quasars have significant $u$-bandvariabilities. The fraction of quasars with large two-epoch variability is muchhigher than that of stars. The selection by variability can select bothlow-redshift quasars with ultraviolet excess and mid-redshift ($2 < z <3.5$)quasars where quasar selection by optical colors is inefficient. The above twoselections are complementary and make full use of the SCUSS u-band advantages.

Capability of Quasar Selection by Combining the SCUSS and SDSS Observations