Abstract: The inherent vibration characteristics of the folding mechanism of the solar arrays are important for the normal operation of the solar array against any resonance. A new type of the solar array folding mechanism is designed. The constrained modal analysis is made and the resonance response of the fan-shaped solar array folding mechanism is analyzed. The natural frequencies of the first twenty orders are obtained through the modal analysis. The loading frequency range is set between 1 Hz and 65 Hz. The harmonic response analysis is made on three dangerous nodes of the mechanism, and the respective frequency displacement is determined. It is shown that the solar array folding mechanism has an overall bending deformation in the frequency range between 6.47 Hz and 11.62 Hz, and the local deformation occurs in the frequency range of 36.49 Hz to 41.22 Hz, with the peak values of the displacement of the three nodes being 21.35 mm, 263.25 mm, and 262.75 mm, respectively.