One　series　of　self-compacting　concrete　(SCC)　specimens　incorporating　fly　ash　and　two　series　of　SCC　specimens　incorporating　both　fly　ash　and　ground　granulated　blast　slag　were　designed.　Based　on　accelerated　carbonation　and　water　absorption　test,　the　effects　of　cement　replacement　by　only　fly　ash　and　by　both　fly　ash　and　slag　powder　on　the　carbonation　resistance　of　SCC　were　studied.　It　is　found　that,　when　the　replacement　rate　of　fly　ash　is　more　than　40%　(by　mass),　the　carbonation　depth　of　SCC　increases　rapidly　as　the　replacement　rate　increases.　However,　replacement　by　both　fly　ash　and　slag　powder　greatly　improves　the　carbonation　resistance　of　SCC　incorporating　massive　fly　ash.　Both　positive　and　negative　effects　caused　by　mineral　admixtures　on　carbonation　resistance　of　SCC　are　analyzed.