Autogenous　shrinkage　of　self-compacting　concrete(SCC)　was　studied　by　restrained　ring　test.　Taking　fly　ash　and　granulated　blast-furnace　slag(GBS)　content　as　main　parameters,　development　of　steel　ring　strains　as　function　of　concrete　age　was　investigated;　correlations　between　steel　ring　strains,　effective　autogenous　shrinkage,　tensile　stress　and　cracking　risk　coefficient(CRC)　of　SCC　specimens　were　studied.　The　results　show　that　the　autogenous　shrinkage　alone　can　cause　cracking　of　concrete　specimens.　Fly　ash　is　helpful　to　decrease　the　tensile　stress　induced　by　autogenous　shrinkage,　but　high　content　of　fly　ash　may　cause　reduction　of　tensile　strength.　The　stress　and　the　tensile　strength　of　the　concrete　are　increased　by　the　addition　of　GBS.　Ring　specimens　cracking　risk　coefficient　is　in　the　range　of　1.00-1.25　and　cracking　risk　coefficient　changes　with　concrete　ages　and　mineral　admixtures.