Ceramsite　foam　concrete　was　produced　by　mixing　fast-hardening　sulphoaluminate　cement　with　precast　foam　and　ceramsite.　The　effects　of　foam　concrete　density　and　ceramsite　particle　size　on　the　failure　mode,　compressive　strength(peak　stress),　densification　strain　and　energy　absorption　of　ceramsite　foam　concrete　subjected　to　static　uniaxial　compression　was　investigated.　The　experiment　results　indicate　that　remarkable　non-interfacial　failure　is　observed　with　higher　density　of　foam　concrete　and　larger　particle　size　of　ceramsite,　from　which　the　density　range　of　foam　concrete　with　matched　strength　of　the　three　corresponding　ceramsite　is　determined.　With　increasing　density　of　foam　concrete,　the　compressive　strength　and　energy　absorption　of　ceramsite　foam　concrete　are　remarkably　improved,　while　the　densification　strain　decreases.　In　addition,　with　increasing　ceramsite　particle　size,　the　densification　strain　decreases　first　then　increases,　the　compressive　strength　increases　first　then　decreases,　and　the　energy　absorption　capacity　gradually　increases.　©　2021,　Editorial　Department　of　Journal　of　Building　Materials.　All　right　reserved.