For improving the dynamic roundness of the sphere hollow rotor in an electrostatic gyro,a rotor was designed to be a long sphere with long-polarized and short-equatorial diameters in a static state to compensate the roundness error caused by the centrifugal load. According to the load elastic distortion formula from the elasticity shell theory,the superposition formula of surface distortions produced by the radial load and the centrifugal load for hollow Be rotor in the Electrostatic Suspended Gyroscope(ESG) was established by using the small distortion independent action and synthesis theory. Then,a long spherical hollow Be rotor with long-polarized and short-equatorial diameters was constructed by the superposition formula. Finally, a sample was taken to explain the design,processing and survey of the long spherical hollow rotor. Experimental results indicate that the polar radius of the long spherical hollow Be rotor is 0.52 μm longer than equator radius,which is well coincident with the design value of 0.54 μm.