At　present,　it　is　unclear　how　the　microstructure　and　multi-scale　mechanical　properties　of　concrete　change　after　ultra-high-rise　pumping.　To　this　end,　this　study　applied　BSE　image　analysis　method　and　nanoindentation　test　to　investigate　the　influence　of　ultra-high-rise　pumping　on　the　porosity,　thickness　and　elastic　modulus　of　interface　transition　zone　(ITZ)　in　concrete,　firstly.　The　results　showed　when　increasing　the　pumping　height,　the　elastic　modulus　and　uniaxial　compressive　strength　of　concrete　and　mortar　increased　slightly,　the　thickness　and　porosity　of　ITZ　decreased,　and　the　elastic　modulus　of　ITZ　increased.　Secondly,　based　on　the　porosity　test　results　of　ITZ　and　paste,　the　volume　fractions　of　pores,　mortar　and　equivalent　body　(aggregate　+　ITZ)　in　concrete　with　different　pumping　heights　were　determined,　and　then　a　3D　model　of　concrete　was　established　based　on　the　X-ray　Computed　Tomography　test　results.　Thirdly,　according　to　the　mechanical　properties　of　the　mortar　before　and　after　ultra-high-rise　pumping,　the　constitutive　relationship　of　the　mortar　in　the　ultra-high-rise　pumping　concrete　was　modified,　and　the　mechanical　parameters　of　the　equivalent　body　in　the　model　considered　different　pumping　heights　were　calculated　by　the　homogenization　method.　Finally,　the　uniaxial　compression　of　ultra-high-rise　pumping　concrete　was　accurately　simulated　using　the　finite　element　method.　On　this　basis,　according　to　the　relationship　between　pumping　measurement　index　(PMI)　and　the　performance　of　ultra-high-rise　pumping　concrete,　the　uniaxial　compressive　stress–strain　curve　of　ultra-high-rise　pumping　concrete　was　precisely　predicted.　©　2020　Elsevier　Ltd