This　paper　aims　to　quantitatively　evaluate　the　creep　properties　of　concrete　through　microscopic　tests　with　a　multiscale　mechanical　homogenization　method　considering　interface　transition　zone　(ITZ).　The　concrete　samples　with　0　or　10%　silica　fume　were　subjected　to　a　360-day　macroscopic　test.　A　series　of　indentation　tests,　microscopic　tests　and　theoretical　studies　were　carried　out　to　obtain　the　creep　properties　of　individual　phases　of　hardened　paste　and　contact　creep　modulus　and　thickness　of　the　ITZ　around　coarse　aggregate.　Results　indicated　that　the　addition　of　silica　fume　significantly　improved　the　quantity　and　quality　of　gel　in　the　matrix.　Meanwhile　the　performance　of　ITZ　was　enhanced　while　its　thickness　was　decreased　by　29%.　The　above　effects　contribute　to　the　improved　ability　of　concrete　to　resist　creep.　To　quantitatively　evaluate　the　creep　properties,　the　concrete　materials　were　divided　into　four　different　scales　from　nanoscale　to　macroscale.　A　homogenization　method　combining　Mori-Tanaka　(MT)　scheme　and　self-consistent　(SC)　scheme　was　used　to　calculate　the　contact　creep　modulus　of　concrete.　Besides,　two　ITZ　simulation　models　of　bond-slip　and　homogeneous　solid　were　discussed　on　the　fourth　scale　to　verify　the　accuracy　of　the　model　and　confirm　the　significances　of　ITZ　properties　and　thickness　in　creep　analysis.