The　nonstoichiometric　CuxAlO2　ceramics　were　successfully　prepared　by　solid　state　sintering　at　high　temperature.　The　effects　of　the　x　value　on　the　band　gap　and　electrical　conductivity　were　investigated.　The　results　show　that　the　structure　and　density　of　CuxAlO2　ceramic　plates　show　a　notable　improvement　with　the　increasing　content　of　Cu.　The　maximum　value　of　density　is　5.02　g/cm3　for　CuxAlO2　ceramic　with　x=0.98　and　the　XRD　pattern　indicates　that　it　is　a　pure　CuA1O2　phase.　The　optical　band　gap　of　CuxA1O2　ceramics　is　about　3.44　eV.　The　conductivity　at　room　temperature　increases　first　and　then　reduces　with　the　increasing　content　of　Cu.　The　maximum　conductivity　is　about　8.03　×　10-3　S/cm　with　x=0.98.　The　temperature　dependence　of　electrical　conductivity　agrees　well　with　the　Arrhenius　relationship,　indicating　that　the　electrical　conducting　is　ascribed　to　thermal　activation　in　the　range　of　100-300　K.　The　minimal　value　of　the　activation　energy　is　estimated　0.085　eV.　The　electrical　conductivity　of　CuxAlO2　ceramics　mainly　depends　on　the　density　of　the　samples　in　the　investigating　range.