The general method of improving the transmission characteristic stability of a frequency selective surface is to miniaturize its unit cell. By loading capacitor and increasing the electric length, this paper designs a dual stop-band miniaturized frequency selective surface. With two periodic structures the proposed frequency selective surface demonstrates the dual stop-band quality, the lumped capacitor between the cross structures can greatly reduce the series resonance frequency and realizes lower stop-band characteristics in S and C band, the meandering lines will increase the series inductance to achieve higher stop-band in the Ku band. The simulation results demonstrate that this structure keeps the excellent transmission stability with respect to different incidence angles. Meanwhile, because the designed frequency selective surface is nice in symmetry, its transmission characteristic is identical for the TE and TM modes of plane wave. This paper verifies the feasibility of the miniaturized method by loading lumped capacitor and increasing the electric length, which is of great reference value for designing frequency selective surface.