We　develop　a　miniaturized　electrostatically　tunable　optomechanical　oscillator,　whose　frequencies　can　be　electrostatically　tuned　by　as　much　as　10%.　By　taking　advantage　of　the　optical　and　the　electrical　spring,　the　oscillator　achieves　a　high　tuning　sensitivity　without　resorting　to　mechanical　tension.　Particularly,　the　high-Q　optical　cavity　greatly　enhances　the　system　sensitivity,　making　it　extremely　sensitive　to　the　motional　signal,　which　is　often　overwhelmed　by　background　noise.