Thiobacillus ferrooxidans was used in bacteria leaching of uranium from uranmite ore leaching system with bacteria and Fe2+, the system with bacteria and without Fe2+, the system with Fe2+ and without bacteria, the system with Fe3+ and without bacteria, the system without bacteria and iron ions, and uncontrolled pH value, and the system without bacteria and iron ions, and controlled pH value of 2. The effects of pH value, redox potential (Eh), ferrous ions, total iron and uranium concentration were examined. The leaching rates for the six uraninite ore leaching systems reached 98.00%, 80.33%, ...