Abstract: On account of the theory of electromagnetic wave absorption,a thin-disk,wide-band,wide-angle Grid-type absorbing composite material was successfully prepared. Through a number of contrastive experiments,test indicated that the absorber,which compounded with Grid-type resistive film and thickness of 1. 1cm gypsum board,had an absorbing peak reached-25 db in 3. 2 ~3. 3 GHz. The absorption rate bandwidth below-10 dB in S-band reached 83%,compared with pure resistive film absorber,the material realized sharply wide-band,thin-disk,and had better practicability. Achievement can be used for indoor electromagnetic interference shielding and pollution protection in S-band.