Debao bauxite deposit in Guangxi province is a karst accumulation type deposit.Although the mud content of the ore is higher in Maai ore field,the test mensuration of tailings produced by washing ore,has testified it has better washability,and the settling velocity curve of the tailings in washing ore has been drawn.Base on the results obtained from the digestion experiment of the ore samples by high pressure Bayer process,the affect factors of ore digestion rate are analyzed.It is thought that ore wash technics can improve the ore digestion rate which can satisfy the need of industrial production of the mine.