The　utilization　of　bottom-up　concrete　pumping　technology　has　become　popular　in　the　construction　of　concrete-filled　steel　tube　arches.　Additionally,　self-compacting　concrete　has　extensive　usage　in　pumping　construction　projects.　During　the　process　of　bottom-up　pumping,　the　selfcompacting　concrete　exerts　lateral　pressure　on　the　inner　wall　of　steel　tube.　Excessive　lateral　pressure　can　lead　to　the　deformation　and　failure　of　steel　tube.　This　paper　aims　to　introduce　a　reliability-based　prediction　model　for　calculating　the　lateral　pressure　in　the　case　of　bottom-up　pumping　self-compacting　concrete.　The　prediction　model　was　founded　upon　the　assumptions　of　viscous　flow　and　the　Bernoulli＇s　principle.　Within　this　model,　an　equilibrium　equation　considering　viscous　loss　was　formulated　and　subsequently　solved　by　using　the　Newton　iteration　method.　Moreover,　a　bias　function　was　incorporated　into　the　equation　to　ensure　precise　solutions.　Based　on　these　solutions　of　equations,　the　probability　density　distributions　of　lateral　pressure　at　various　vertical　heights　were　obtained.　Then,　lateral　pressure　prediction　was　achieved　by　establishing　a　specific　probability　as　the　standard　for　prediction.　Finally,　The　effectiveness　of　this　prediction　model　was　validated　through　a　comparison　between　the　lateral　pressure　data　obtained　from　prior　full-scale　tests　and　the　predicted　values.　The　results　demonstrate　that　the　prediction　model　is　capable　of　predicting　the　lateral　pressure　with　a　reserve　of　safety.　The　stability　of　prediction　performance　increases　when　the　vertical　heights　of　the　self-compacting　concrete　are　higher　than　10　m.