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Different kinds of layered composites were prepared based on the MWCNT/SMP composites with 10 wt% MWCNTs loading.The results of conductivity test showed various conductivities of these composites.The distribution of MWCNTs and layered structure were confirmed by FESEM and OM observation.The SE and SER were measured and investigated.The results suggested that the SE increased obviously with increase in number of layers for LCS and LCP, and 25 dB was achieved at 18GHz.But the SER not only depended on the number of layers but also related to frequency.As to LCI, the insertion of SMP could effectively increase the SE while decrease the SER in specific frequency ranges.