Micro-scratch　tests　of　copper,　polycarbonate,　fused　silica　and　soda-lime-silica　glass　were　carried　out　with　Rockwell　C　diamond　indenter.　It　is　the　first　time　in　China　that　scratch　method　is　used　to　measure　fracture　toughness　of　materials.　The　results　show　that　when　the　scratch　depth　was　relatively　shallow,　the　spherical　area　at　the　top　of　the　indenter　must　be　considered.　And　the　indenter　shape　function　was　quite　different　when　the　spherical　area　at　the　top　of　the　indenter　was　not　considered.　After　considering　the　spherical　area　at　the　top　of　the　indenter,　the　fracture　toughness　by　the　linear　elastic　fracture　mechanics　(LEFM)　model　is　close　to　that　by　the　energetic　size　effect　law　(SEL)　model.　The　fracture　toughness　by　LEFM　is　in　good　agreement　with　that　by　the　single-edge　notched　beam　(SENB)　method　and　the　chevron-notched　beam　(CNB)　method　or　indentation　fracture　(IF)　method.　The　calculation　result　was　not　good　when　the　spherical　area　at　the　top　of　the　indenter　was　not　considered.　When　SEL　model　was　used,　the　error　of　fracture　toughness　estimated　by　equivalent　half-apex　angle　of　projected　contact　area　was　smaller　than　that　assessed　by　equivalent　half-apex　angle　of　the　perimeter,　which　was　close　to　that　by　LEFM　model.　©　2019,　Science　Press.　All　right　reserved.