Relevant　numerical　simulation　and　characteristic　analysis　were　conducted　based　on　Fick＇s　second　law　of　moisture　transport,　using　the　finite　difference　method,　and　considering　the　effects　of　slab　temperature,　water　absorption　base　capacity　and　supply,　and　concrete　self-desiccation　on　slab　moisture.　Then　the　numerical　simulation　program　was　verified　by　comparison　with　laboratory　tests　and　field　tests　in　different　seasons　and　with　similar　foreign　research.　The　research　shows　that　the　models　and　parameters　in　the　paper　can　accurately　simulate　moisture　pavement　moisture　characteristics.　However,　the　coupled　effect　of　concrete　temperature　and　moisture　and　the　moisture　convection　boundary　conditions　at　the　base　should　been　considered　in　numerical　simulation.　Using　a　Neumann　boundary　with　null　moisture　flux　at　the　bottom　of　the　slab　can　cause　predicted　values　to　be　higher　than　actual　values.　Environmental　parameters,　paving　time,　and　curing　methods　greatly　affect　early-age　moisture　of　pavements.　By　contrast,　the　effect　of　material　parameters　is　not　obvious.　It　is　recommended　to　study　the　top　and　bottom　boundary　conditions　and　parameters　of　the　program　in　more　detail,　and　pavement　construction　under　hot　seasons,　high　temperatures,　or　on　an　overly　wet　base　should　be　avoided　as　possible.