Ceria-zirconia-alumina　composite　oxides　(the　molar　ratio　of　Ce,　Zr　and　Al　is　1:1:2)　were　prepared　by　the　coprecipitation　(CZA),　mixing　suspension　of　precipitates　(CZ+A),　stepwise　precipitation　Ⅰ　(CZ-A)　and　Ⅱ　(A-CZ)　methods,　respectively.　The　structure　and　performance　of　the　composite　oxides　were　studied　by　X-ray　diffraction　(XRD)　and　other　means.　The　results　showed　that　the　characteristic　diffraction　peaks　belonging　to　Zr0.4Ce0.6O2　cubic　phase　only　appeared　in　the　four　kinds　of　samples,　among　which　the　cell　parameters　and　crystal　size　of　CZA-1000　were　significantly　smaller;　Four　kinds　of　samples　possessed　mesoporous　characteristics,　larger　specific　surface　area,　and　only　CZA-1000　still　showed　unimodal　distribution　curve,　narrow　and　the　smallest　pore　size　distribution.　The　oxygen　storage　capacity　(OSC)　of　the　aging　CZA-1000　was　the　largest.　The　main　peak　temperature　of　the　reduction　peak　of　CZA-1000　was　23~30℃　lower　than　that　of　the　other　three　aging　samples.　The　bulk　phase　oxygen　of　CZA-1000　has　stronger　mobile　performance,　while　the　main　peak　temperature　of　the　reduction　peak　of　the　other　three　aging　samples　were　higher　and　the　sintering　is　more　serious.　It　was　found　that　the　particles　of　cerium-zirconium　and　alumina　in　the　CZA　samples　prepared　by　co-precipitation　were　evenly　mixed　at　the　nanoscale,　with　stronger　interaction　and　better　＂diffusion　obstruction＂　effect　among　each　other,　thus　exhibiting　better　structure,　texture,　oxygen　storage,　reduction　and　heat　resistance　properties.　©　2020,　Editorial　Office　of　Journal　of　the　Chinese　Society　of　Rare　Earths.　All　right　reserved.