Flaky　α-Al2O3　with　different　sizes　and　morphologies　was　synthetized　by　molten　salt　synthesis　using　Al2(SO4)3　as　raw　material.　The　formation　mechanism　of　flaky　alumina　and　the　influence　of　different　titanium-containing　additives　(TiOSO4,　TBOT,　and　TiO2)　on　the　growth　of　α-Al2O3　crystal　were　discussed　by　SEM,　XRD　and　EDS.　Results　showed　that　pure　α-Al2O3　can　be　obtained　by　adding　all　the　three　kinds　of　titanium-containing　additives,　but　the　diameters,　thickness,　and　the　morphologies　of　flaky　α-Al2O3　were　greatly　affected　by　the　different　titanium　sources.　The　adding　of　TiOSO4　additive　resulted　in　the　largest　diameter　of　alumina　platelets,　while　adding　TiO2　additive　would　greatly　reduce　the　diameters.　The　growth　velocities　of　crystal　planes　in　diameter　and　thickness　direction　were　influenced　by　the　distribution　differences　of　the　titanium　ions,　which　resulted　in　different　morphologies　of　alumina　platelets.　Diverse　reaction　routes　for　different　titanium　sources　in　preparation　process　were　also　discussed　in　this　paper.　©　2015　Elsevier　Ltd　and　Techna　Group　S.r.l.