To　accurately　calculate　the　temperature　expansion　and　contraction　deformation　of　the　beam　ends　of　the　bridges　with　their　deck　slabs　extended　by　the　hollow　slabs,　a　bridge　of　the　same　kind　was　selected　as　an　example　and　the　relevant　study　of　the　bridge　was　made.　The　temperature　fields　of　the　main　beam　cross　section　and　the　expansion　and　contraction　deformation　of　the　beam　ends　of　the　bridge　were　monitored　and　the　values　of　the　monitored　expansion　and　contraction　deformation　were　compared　to　those　calculated　respectively　by　the　average　temperature　of　the　cross　section,　deck　slab　temperatures　and　by　the　effective　temperature　standard　values　as　provided　in　the　codes.　The　MIDAS-FEA　was　used　as　well　to　build　up　the　finite　element　model　for　the　hollow　slab　cross　section,　the　influences　of　the　structural　parameters　on　the　average　temperature　of　the　hollow　slab　cross　section　were　studied　and　the　differences　between　the　extreme　values　of　the　average　temperature　and　the　code　values　of　the　hollow　slab　cross　section　in　the　different　climate　regions　in　China　were　compared.　The　results　indicate　that　the　calculation　of　the　expansion　and　contraction　deformation　of　the　beam　ends　of　the　bridges　with　the　deck　slabs　extended　by　the　hollow　slabs,　using　the　values　of　the　average　temperature　of　the　cross　section　is　quite　accurate.　At　the　historical　extreme　high　temperature　stage,　with　the　increase　of　the　main　beam　depth　and　deck　pavement　thickness　of　the　bridges,　the　highest　value　of　the　average　temperature　of　the　cross　section　decreases.　In　the　calculation,　the　utilization　of　the　effective　temperature　standard　values　in　the　codes　may　underestimate　the　expansion　and　contraction　deformation　of　the　beam　ends　of　the　bridges.　©　2018,　Journal　Press,　China　Railway　Bridge　Science　Research　Institute,　Ltd.　All　right　reserved.