A　resonant　pressure　sensor　with　piezoelectric　excitation　and　sensing　is　presented,　which　is　realised　by　combining　a　micromachined　diaphragm　and　a　quartz　resonator.　The　sensor　performance　is　improved　by　introducing　double　enhancement　beams　into　the　diaphragm.　Finite　element　method　is　utilised　to　reveal　the　validity　and　optimise　the　structural　dimensions.　A　self-excitation　circuit　is　designed　to　drive　the　resonator　into　steady　oscillation.　The　sensor　chip　is　fabricated　by　bulk　micromachining　technologies　and　packaged　in　a　metal　shell　in　the　inert　gas　environment　for　characterisation.　The　performance　characteristics　including　the　short-term　drift,　temperature　characteristic　and　quality　factor　are　investigated.　The　experimental　results　demonstrate　that　the　sensor　features　a　high　sensitivity　of　100.45　Hz/kPa　and　a　short-term　drift　＜14　ppm　in　the　operating　range　of　-10　approximate　to　10　kPa　at　room　temperature.　Owing　to　the　excellent　performance　in　sensitivity　and　accuracy,　the　sensor　can　be　applied　for　micropressure　measurement.