To　characterize　the　elastic　modulus　and　yield　strength　of　metallic　materials　by　Knoop　hardness,　the　modified　Marshall　model　and　Conway　model　were　proposed　to　characterize　the　elastic　modulus,　and　the　modified　Lockett,　Yu,　Marsh,　Johnson　and　Vandeperre　models　were　proposed　to　characterize　the　yield　strength,　broadening　the　new　application　of　Knoop　hardness　to　the　characterization　of　mechanical　properties　of　metallic　materials.　Knoop　hardness　tests　were　carried　out　on　35　metals.　The　positive　indentation　size　effect　of　Knoop　hardness　(hardness　increases　with　the　decrease　in　load)　was　analyzed　by　Meyer＇s　law,　elastic-plastic　deformation　(EPD)　model,　Hays-Kendall　model,　and　proportional　specimen　resistance　(PSR)　model.　It　was　found　that　the　hardness　under　large　loads　can　be　approximated　to　be　constant,　and　can　be　used　to　represent　true　hardness　of　the　material.　For　the　first　time,　the　influence　of　pile-up　around　the　short　diagonal　of　Knoop　indent　was　considered　to　modify　Marshall　model　and　Conway　model　as　follows:　the　constant　parameter　α　in　the　original　Marshall　model　was　modified　as　a　quadratic　function　of　b/d　(the　ratio　of　the　short　diagonal　to　the　long　diagonal　of　the　residual　Knoop　imprint),　and　a　correction　coefficient　β　linearly　increasing　with　the　square　of　b/d　was　introduced　to　Conway　model.　By　comparing　the　values　of　yield　strength　in　the　literature　and　those　calculated　by　original　models,　a　correction　coefficient　k　was　introduced　to　modify　Lockett,　Yu,　Marsh,　Johnson　and　Vandeperre　models　for　the　calculation　of　yield　strength　of　metals　for　the　first　time.　The　results　showed　that　except　for　Ti6Al4V　and　Sn,　values　of　elastic　modulus　obtained　from　the　modified　models　were　consistent　with　those　from　instrumented　indentation,　with　a　confidence　degree　no　less　than　0.　94.　Similarly,　except　for　spring　steel　60Si2Mn,　values　of　yield　strength　obtained　from　the　modified　models　were　consistent　with　those　in　the　literature,　with　a　confidence　degree　no　less　than　0.　90.　©　2024　Harbin　Institute　of　Technology.　All　rights　reserved.