Alumina precursors synthesized by neutralization method,hydrothermal method,alcoholic aluminium method and aluminium powder-hydrochloric acid reflux method were used as raw materials to prepare spherical alumina carriers which are marked as ZH、SR、ST and SOL respectively.The samples were characterized by strength tester,XRF,BET,SEM and NH₃-TPD,etc.The effect of the alumina support on the performance of Pt-Sn-K/Al₂O₃ catalysts in the dehydrogenation of propane was investigated.The results showed that the alumina precursors synthesized by different methods have been used to prepared spherical alumina supports with high strength.Especially the alumina supports prepared by hydrothermal method and alcoholic aluminium method also had large pore volume and moderate specific surface area.The preparation methods of precursors had greater influence on the acidity of catalysts,while neutralization catalyst was mainly weak-medium-strong acid center and other catalysts were mainly weak acid center,and the order of acidity was ZH-CAT>SOL-CAT>ST-CAT>SR-CAT.The evaluation results showed that the supports prepared by alcoholic aluminium method and hydrothermal method had good performance for propane dehydrogenation catalyst,which was equivalent to or even superior to the industrial catalyst.