The　purposes　of　this　work　were　to　obtain　the　accurate　elastic　modulus　of　the　nanocrystalline　WC-Co　cemented　carbides,　and　to　propose　the　mechanism　for　the　difference　of　elastic　modulus　between　the　nanocrystalline　and　conventional　polycrystalline　cemented　carbides.　The　nanocrystalline　cemented　carbide　was　prepared　by　spark　plasma　sintering　(SPS)　technique.　The　conventional　polycrystalline　cemented　carbides　were　prepared　by　SPS　and　sinter-HIP　techniques　as　references,　respectively.　The　sintered　cemented　carbides　were　characterized　by　X-ray　diffractometry,　scanning　electron　microscopy　and　the　transmission　electron　microscopy　with　precession　electron　diffraction　technology.　The　elastic　modulus　was　obtained　by　averaging　the　values　measured　with　the　continuous　stiffness　measurement　method　of　the　nanoindentation　technology.　The　results　show　that　the　nanocrystalline　cemented　carbide　has　a　relatively　low　modulus,　which　could　be　attributed　to　the　more　interface　area　and　higher　fraction　ratio　of　the　hep　cobalt　phase　caused　by　the　rapid　heating　and　cooling　process　during　SPS.