Abstract: This research is regarded as one of the fundamental studies on extracting vanadium and gallium with autoclave leaching after oxygen blast oxidizing Ga-containing hot V-slag.The orthogonal test was adopted to carry out the experiment of extracting gallium with alkaline leaching from V-leached residue.The leaching percentage of Ga (η_Gn.) changes mainly with alkali concentration of leaching solution and leaching temperature.Maximum η_Ga about 65% can be obtained when wt.ratio of alkali (NaOH) to water in leaching solution is 0.271 and leaching temperature about 475K.In order to minimize iron and silicon and extract V and Ga in the leaching solution,alkali concentration should be raised,holding time should be kept in optimum range and desired leaching temperature is 475K.