The　aerostatic　spindle　often　occur　offset　and　additional　vibration　under　the　action　of　external　load　due　to　the　low　stiffness,　thus　affecting　the　rotary　accuracy　of　the　spindle.　In　order　to　solve　the　problem　of　unbalanced　vibration　of　the　spindle,　a　new　type　of　controllable　radial　aerostatic　bearing　is　designed　by　combining　piezoelectric　ceramics.　A　bearing-rotor-piezoelectric　ceramic　coupling　model　was　established,　and　the　control　method　of　variable　structure　sliding　mode　control　was　used　to　reduce　the　vibration　amplitude　due　to　the　unbalance.　From　the　results　of　simulation　and　experiment,　it　is　found　that　when　the　disturbance　is　taken　as　a　constant　value,　the　vibration　amplitude　increases　with　the　increase　of　force;　when　the　disturbance　force　is　an　unknown　random　force,　the　control　effect　is　slightly　worse　than　that　when　the　disturbance　force　is　known,　but　the　rotary　accuracy　can　be　improved　by　this　suppression　effect　on　the　aerostatic　spindle.　Finally,　the　correctness　and　effectiveness　of　this　control　method　are　proved　through　experiments.