Abstract: The red mud of Bayer's method has a very special mineral compositions and poor mechanical properties, It's the first time to use Bayer's drytype storage of red mud in the yard at home by Ping-guo aluminum company. The properties of red mud has been examined by the experimental tests including particle size distribution, mineral compositions, chemical compositions, physical and mechanical properties. It's concluded that the Bayer's red mud with high Fe2O3 content, small particle size and belongs to poor grading soil; Based on the operation characteristics of red mud yard, Its points out that the problems of drainage system as well as the consolidation of the red mud, the studies shows that the later stage of red mud yard may be immersed in the water with a long time due to the slow drainage, and thus it would be has some effect on the stability of red mud yard.