To acquire the zero-gravity surface figure error of an aspherical mirror in a ground fabricating environment, a high-precision rotation method based on gravity compensation technology was established. First, the basic principle of the N equal interval rotation method is introduced. Second, combined with an aspheric ultra low expansion (ULE) mirror with a diameter of Ф1 290 mm processing, the rotation angle and off-center control methods are given, respectively, and the angle error and off-center error are better than 0.1° and 0.1 mm, respectively. Third, in the low-precision stage, the rotation result is processed by three-position rotations and the surface accuracy of the mirror quickly converges to 0.029λ-RMS. At the same time, the symmetry error on the mirror surface is cumulatively amplified due to the application of the rotation method. After removal, the surface accuracy further converges to 0.023λ-root mean square (RMS). Finally, the six-position rotations are used to guide the optical manufacturing. The surface figure error of the mirror in the six directions is 0.012λ-RMS and 0.010λ-RMS by removing the gravity deformation error, which allows it to be considered as a zero-gravity mirror in the space environment after the satellite is in orbit. The method described in the studyis not only applicable to the fabrication of one meter-level mirrors, but also to larger space aspheric mirrors with the goals of a zero-gravity surface figure error.