Aluminum　titanate　was　in-situ　synthesized　by　using　industrial　waste-residue　in　the　aluminum　factory　and　Tio2　as　the　main　raw　materials　and　the　influence　of　different　reaction　temperatures　on　the　purity　and　microstructures　of　synthesized　products　were　mainly　discussed.　The　obtained　Al　2TiO5　was　characterized　by　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM)　and　relevant　analytical　software.　The　results　show　that　elevating　the　sintering　temperature　can　increase　the　content　of　aluminum　titanate;　and　at　1420　C°,　it　reaches　the　highest　in　the　synthesized　ceramic.　When　the　sintering　temperature　continues　to　increase,　the　produced　aluminum　titanate　will　decompose　resulting　in　the　drop　of　its　content.　Therefore,　the　optimum　sintering　temperature　of　in-situ　synthesis　of　aluminum　titanate　is　determined　as　1420　C°,　at　which　the　grains　of　aluminum　titanate　grow　completely,　the　purity　of　aluminum　titanate　is　89.3wt%.,　the　highest　density　is　2.75　g/cm3,　and　the　porosity　is　9%.