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Carbon nanotube@polypyrrole (CNT@PPy) hybrids have been successfully fabricated via a simple in situ chemical oxidation polymerization.The thickness of the PPy shell can be finely controlled in the range of 3.0-6.4 nm.The dielectric loss of core-shell hybrids can be tuned by the shell thickness,resulting in a well-matched characteristic impedance that can enhance electromagnetic wave (EMW) absorption performance.Minimum reflection loss of the hybrid with moderate PPy shell thickness can reach-51.4 dB at 11.8 GHz with a matching thickness of merely 2mm.Furthermore,the minimum reflection loss values of the hybrid are below-30 dB even at thickness in the range of 1.4-1.9mm,endowing the possibility of practical application of the hybrids in electromagnetic wave absorption field.