The flow characters of caved ore and rock is important for reducing ore lose and ore dilution. Firstly, the effected reasons of flow characters for caved ore and rock are analyzed. Secondly, experiments are carried out to study the granular flow characters considering the size of drawing hole, size of grain and type of material by index grain method. The relationship among the moving border, size of drawing hole, size of grain, type of grain and the height of grain is studied. The relationship between the size of drawing hole and the released quantity is studied by plane pattern and stereo pat...