In　order　to　understand　the　behavior　and　formation　mechanism　of　cement　concrete　pavement　curling　at　its　early　age,　vibrating　wire　sensors　with　a　large　range　were　designed　to　monitor　the　vertical　displacement　of　slabs,　and　the　whole　vertical　deformation　in　the　first　14　days　of　slabs　under　summer　conditions　was　continuously　monitored.　The　behavior　and　formation　mechanism　of　early-age　curling　were　numerically　analyzed　by　the　special　early-age　character　simulation　program.　The　results　show　that:　the　evolution　behavior　of　the　early-age　curling　has　three　stages,　namely,　flat　slab　to　corner　curling,　corner　curling　to　intermediate　curling　with　slab　uplift　at　1/4　positions,　and　corner　curling　to　intermediate　curling　to　curling　at　the　middle　of　a　slab.　There　are　several　curling　modes　and　asymmetric　phenomena　in　the　early　age　of　slab　deformation.　Early-age　curling　is　significantly　correlated　with　an　environmental　field,　with　concrete　modulus,　with　creep　and　with　structural　restraint.　Creep　has　a　significant　dissipation　effect　on　the　early-age　behavior　of　a　slab.　In　the　combination　case　of　insufficient　constraint　and　insufficient　driving　of　temperature　deformation,　the　solidification　shape　of　1/4　diagonal　slab　uplift　and　will　be　produced,　resulting　in　local　unevenness　and　the　void　in　corresponding　position　of　a　slab.　It　is　suggested　that　the　action　characteristics　of　early-age　built-in　deformation　and　basis　parameters　should　be　distinguished,　and　the　effect　of　built-in　deformation　can　be　equivalently　reflected　by　support　states.　©　2021,　Engineering　Mechanics　Press.　All　right　reserved.