Based　on　1/4　slab　simulation　program,　considering　the　interface　friction　between　the　slab　and　base,　a　simulation　program　for　3D　early-age　curling　of　full-scale　slab　was　developed　and　validated　by　field　experiments.　Compared　with　the　1/4　slab　program,　full-scale　slab　programs　which　consider　the　interface　friction　may　reduce　displacement　at　the　corner　of　the　slab,　and　the　magnitude　of　daily　variation　and　slab　displacement　calculated　by　full-scale　slab　program　are　more　identical　to　experimental　results.　Additionally,　the　calculation　iterative　convergence　is　greatly　influenced　by　parameters　of　the　interface　between　slab　and　base.　Due　to　process　effect　in　early　age　slabs,　lots　of　complex　responses　are　evidenced　in　slabs　under　different　case　combinations.　Simulation　results　show　that　early-age　slabs　display　curling　movement　from　the　corner　to　1/4　of　the　distance　away　from　the　center　of　slab.　Asymmetric　curling　in　the　slab　is　caused　by　different　boundary　constraints.　Under　superimposed　and　repeated　effects　(remember-relax-remember)　over　28　days　in　summer,　a　positive　built-in　temperature　difference　exists　in　slabs　generally.　Owing　to　the　complexity　of　concrete　early-age　behavior,　further　research　in　model　optimization,　characteristics　of　early-age　material　parameters,　and　the　effect　of　construction　technology　on　numerical　simulation　of　early-age　slabs　are　suggested.　©　2017,　Engineering　Mechanics　Press.　All　right　reserved.