Abstract: Aiming at the problems of high energy consumption，high emission，large impact on the surrounding environment，high maintenance cost in traditional uranium tail slag processing methods，the cementing effect of Bacillus Pasteurii induce deposition on calcium carbonate uranium tail slag was studied.Results indicated that，adding Bacillus Pasteurii can efficiently cement uranium tail slag.Bacteria liquid uranium cementing effect on coarse tail slag is better than on fine grained cement.The interval between cemented uranium tails slag are filled with CaCO3，which forms of different sizes of spherical aggregates，belongs to calcite type.The compressive strength on cementing body analysis results show that,as the consolidation time extension，compressive strength of cementing body gradually improves,when biological cementation sand column was compressed，it′s broken from the both ends of cementing body.Compressive strength of coarse sand was obviously higher than that of the fine sand，and higher the filling，the higher the compressive strength.adding carbon nanotubes can markedly increase the compressive strength of the cement.

Key words: Bacillus Pasteurii, Uranium tail slag, Agglutination