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Young\'s modulus is a critical parameter for designing lightweight structure,but Al and its alloys only demonstrate a limited value of 70-72 GPa.The introduction of carbon nanotubes (CNTs) is an effective way to make Al and its alloys stiffer.However,little research attention has been paid to Young\'s modulus of CNT/Al nanocomposites attributed to the uncertain measurement and unconvincing stiffening effect of CNTs.In this work,improved Young\'s modulus of 82.4 ± 0.4 GPa has been achieved in 1.5 wt％ CNT/Al nanocomposite fabricated by flake powder metallurgy,which was determined by resonance test and 13.5％ higher than 72.6 ± 0.64 GPa of Al matrix.A comparative study and statistical analysis further revealed that Young\'s modulus determined by tensile test was relatively imprecise (83.1 + 4.0 GPa) due to the low-stress microplasticity or interface decohesion during tensile deformation of CNT/Al nanocomposite,while the value (98-100 GPa) was highly overestimated by nanoindentation due to the “pile-up” effect.This work shows an in-depth discussion on studying Young\'s modulus of CNT/Al nanocomposites.