A　piezoelectric　pump　with　its　Y-shape　elements　is　presented.　Two　Y-shape　pipes　are　fixed　outside　the　chamber　serving　as　an　inlet　and　outlet,　with　the　chamber　and　a　piezoelectric　vibrator　being　the　actor.　The　pump　has　the　potential　to　be　miniaturized　and　integrated.　Eddies　occurring　in　the　Y-shape　elements　are　smaller,　which　is　beneficial　for　the　transport　of　living　cells　or　long-link　macromolecules.　In　this　paper,　the　structure　of　the　pump　is　first　presented.　Then,　the　equations　on　the　change　in　volume　and　the　mean　pressure　in　the　chamber　are　established,　as　well　as　the　relation　between　the　flow　rate　and　the　working　frequency　of　the　piezoelectric　vibrator.　Moreover,　the　relation　between　the　mean　pressure　in　the　chamber　and　the　working　frequency　of　the　piezoelectric　vibrator　is　established.　Finally,　experiments　are　carried　out　to　test　the　characteristics　of　the　pump　and　to　verify　the　correction　of　the　theory　on　this　pump.　©　Higher　Education　Press　2007.