In　this　paper,　the　influence　of　MEMS　gyroscope＇s　tuning　voltage　on　its　resonant　frequency　is　investigated　analytically　and　experimentally.　The　theoretical　deduction　shows　that,　with　the　increase　of　the　tuning　voltage,　the　frequency　of　drive　mode　is　constant　due　to　area-changing　electrostatic　driving　scheme,　while　the　square　of　the　frequency　of　the　sense　mode　is　linearly　dependent　on　the　square　of　the　tuning　voltage　due　to　the　gap-changing　electrostatic　sensing　scheme.　Experimental　results　demonstrate　good　agreement　with　the　theoretical　analysis.　Furthermore,　the　frequency　of　sense　mode　is　affected　by　the　structure　and　fabrication　process　of　MEMS　gyroscopes.　©　2015　IEEE.