With　the　increase　of　soil　consolidation　degree,　the　pore　water　pressure　induced　by　thermal　loading　drops　dramatically.　To　conveniently　and　quickly　calculate　the　thermal　pore　water　pressure　inside　the　soil　under　different　overconsolidation　states　and　quantify　overconsolidation　effect　on　thermal　pore　water　pressure,　a　calculation　method　of　thermal　pore　water　pressure　considering　overconsolidation　effect　for　saturated　clay　is　proposed.　The　method　is　verified　by　the　relevant　experimental　data,　and　good　agreements　were　achieved.　Through　analyzing　the　influence　mechanism　of　OCR　on　the　thermal　pore　water　pressure,　three　important　findings　were　captured.　(1)　For　overconsolidated　clay,　thermal　pore　water　pressure　decreases　nonlinearly　with　the　increase　of　OCR.　(2)　There　is　a　critical　threshold　of　OCR　4.3;　when　1　＜　OCR　＜=　4.3　(slightly　overconsolidated　state),　the　ratio　of　compression　line　slope　to　recompression　line　slope　(?)　of　overconsolidated　clay　is　consistent　with　that　of　the　normally　consolidated　clay,　while　when　OCR　＞　4.3　(highly　overconsolidated　state),　the　value　of　?　is　smaller　than　that　of　normally　consolidated　clay.　(3)　For　highly　overconsolidated　clay　(OCR　＞　4.3),　considering　the　reducing　of　?　with　OCR,　the　prediction　accuracy　of　the　thermal　pore　pressure　calculation　method　has　been　greatly　improved;　especially　when　OCR　equals　30,　the　prediction　accuracy　improves　by　92.7%　as　temperature　change　achieves　35　degrees　C.