Abstract: A composite absorptive frequency selective surface (AFSS) structure was proposed, being composed of metamaterial absorber (MA) and frequency selective surface (FSS). The composite MA was designed with a composite of a planar square ring structure loaded with resistors and a three-dimensional double-sided open C-ring structure, providing an absorption frequency band from 4.79 to 30.57 GHz, presenting polarization insensitive characteristics and stable absorption within 45° oblique incidence. The FSS was designed with a ring-shaped slot spiral structure, achieving an insertion loss less than 1 dB from 1.96 to 2.16 GHz frequency band through six spiral winding branches, forming a low-frequency passband. The composite AFSS formed by the combination of the two can achieve better wave penetration in the 1.28 to 1.38 GHz frequency band and broadband wave absorption in the 4.88 to 30.58 GHz frequency band, achieving the integrated wave absorption performance.