In mining production, it is impossible to directly measure the drawing-out repose angle of the fragmented ore/rock bulk.Therefore,the best method is to calculate it from those easily measured parameters. The drawing-out repose angle of the bulk can be described using the averaged size and the unhomogeneity of the bulk. In this paper the calculation methods for the averaged size of various bulks and their unhomogeneity are dealt with,and a correlation equation is established between the repose angle and the unhomogeneity.