Abstract: The digestion efficiency of Australian Weipa ore and using it in digestion process were investigated. Effects of sweetening temperature/time and dosage of Weipa ore on the digestion efficiency were comparatively studied. The results showed that Weipa ore is gibbsite and its leaching efficiency is high when digested at higher than 200°C, so applicable to sweetening ore in digestion process, under conditions that the sweetening process is controlled in the range of 195-200°C for 15-20 min and the dosage of Weipa ore is 15wt%-20wt% of the quantity of ore added in the process of Bayer process. The slurry thus sweetened shows an excellent settling compression performance.