By　using　a　measuring　system　designed　by　authors　for　autogenous　shrinkage　of　concrete,　the　influences　of　fly　ash＇s　use　level　and　water-binder　ratio　on　the　early　autogenous　shrinkage　of　self-compacting　concrete(SCC)　were　studied.　The　concrete＇s　microcosmic　pore　distribution　was　also　studied　by　air　bubble　measurement　and　mercury　intrusion　porosimetry.　The　results　show　that　the　early　autogenous　shrinkage　of　SCC　can　be　reduced　by　adding　fly　ash.　With　the　increasing　use　level　of　fly　ash,　the　early　autogenous　shrinkage　is　reduced.　The　early　autogenous　shrinkage　is　increased　with　the　reduction　of　water-binder　ratio.　The　early　autogenous　shrinkage　of　SCC　depende　greatly　on　its　microcosmic　pore　distribution.　The　pore　with　diameter　of　050　nm　has　greatest　influence　on　the　early　autogenous　shrinkage　of　SCC.