In　order　to　study　the　mechanical　properties　of　self-compacting　lightweight　aggregate　concrete　under　complex　stress,　experimental　research　on　multi-axial　stress　behavior　of　self-compacting　lightweight　aggregate　concrete　were　conducted　by　using　a　large　general　triaxial　test　machine.　Through　multi-axial　tests,　failure　morphology　and　stress-strain　curves　of　self-compacting　lightweight　aggregate　concrete　under　different　lateral　stresses　were　obtained.　By　extracting　the　stress-strain　curve　eigenvalues　(peak　stress　and　peak　strain)　and　analyzing　the　failure　morphology,　and　citing　the　relevant　literature　to　compare　and　analyze　the　conclusions　of　multi-axial　research　on　ordinary　concrete　and　lightweight　aggregate　concrete,　the　multi-axial　stress　characteristics　and　failure　mechanism　of　self-compacting　lightweight　aggregate　concrete　were　studied.　The　results　show　that　when　the　uniaxial　compression　and　lateral　stress　values　of　self-compacting　lightweight　aggregate　concrete　are　small,　the　biaxial　compression-pressure　failure　morphology　mainly　exhibits　the　shear　failure　morphology,　which　is　different　from　that　of　ordinary　concrete　and　lightweight　aggregate　concrete.　At　the　same　time,　the　influence　of　lateral　stress　on　self　compacting　lightweight　aggregate　concrete　is　obviously　stronger　than　that　of　ordinary　concrete　and　lightweight　aggregate　concrete.　The　failure　criterion　of　self-compacting　lightweight　aggregate　concrete　based　on　Kupfer　biaxial　failure　criterion　and　octahedral　stress　space　has　certain　applicability.　The　content　studied　in　this　paper　has　theoretical　significance　for　the　engineering　application　development　of　self　compacting　lightweight　aggregate　concrete.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.