To　understand　the　characteristics　of　early-age　built-in　temperature　in　JPCP,　the　actual　data　of　construction　climate　conditions　of　typical　regions　in　China　were　investigated.　Based　on　the　application　of　early-age　JPCP　temperature　numerical　simulation　program,　built-in　temperature　characteristics　of　early-age　pavement　in　typical　regions　was　analyzed.　The　results　show　that　the　pavement　constructed　in　different　climate　conditions　produce　difference　characteristics　of　early-age　built-in　temperature　due　to　geographical　distinction.　Positive　built-in　temperature　difference　of　JPCP　is　larger　in　the　regions　which　have　difference　in　temperature　between　day　and　night　or　higher　solar　radiation　intensity,　while　the　negative　built-in　temperature　difference　isn＇t　influenced　obviously　by　different　regions　and　paving　conditions.　The　maximum　positive　(negative)　built-in　temperature　difference　generally　appears　in　pavement　constructed　in　hot　summer.　The　air　temperature　is　the　major　factor　affecting　built-in　basic　temperature.　The　higher　air　temperature,　results　in　the　higher　built-in　basic　temperature　(temperature　in　slab　bottom)　is.