Abstract: Two improvements for the high-precision degree measurement of Electrostatic Suspended Gyro have been obtained in this paper: no electric-breakdown during initial-levitation process between rotor and its cavity, lower preload and constant open-loop gain in the whole ragulation range for ESS(Electrostatic Suspension System). The achievements are based on the following considerations and designs: initial-levitation control with continuous variable-structure model, preload control with imitated-linear one, system control with absolute square-root one and all boundary layers with sliding model