Self-compacting　concrete(SCC)　is　increasingly　being　used　day　by　day　as　a　structural　material.　In　this　paper,　according　to　the　uniaxial　compressive　testing　of　the　SCC　with　different　content　of　fly　ash,　the　stress-strain　relationship　of　SCC　and　the　effect　of　seven　fly　ash(FA)　levels　and　two　curing　ages(7　and　28　days)　on　the　stress-strain　behavior　are　analyzed.　The　results　shows　that　the　stress　peak　of　SCC　decreases　with　the　increasing　content　of　fly　ash　and　decreasing　curing　age.　Based　on　the　experimental　results,　the　formula　for　the　stress-strain　relationship　of　SCC　is　suggested　and　verified　by　numerical　simulation.