At present, the southern flank of the Yili basin is a typical area for the occurrence of in situ leachable interlayer oxidation zone type sandstone hosted uranium deposits in China. A lot of research work focused on the ore controlling factors, metallogenic environment and metallogenic prospect has been carried out in recent years. Owing to the fact that such deposits being mostly concealed ones are usually covered by thick overburden, the recognition of the occrrrence for such deposits becomes both the technical key and the hard point in prospecting. Supported by the Open Laboratory of Nuclear Energy Resources Research, the authors taking the southern flank of the Yili basin as an example performed a special research on the recognition model for concealed in situ leachable sandstone type uranium deposit.