In this paper,the form of water existing in the bulk ore-rock is analyzed,the importance of research on the flow property of bulk ore-rock is expounded.The influence of water content on the flow property of bulk ore-rock is researched.At the same time,the effect of water content on the fractional force and cohesive force between ore-rock granules bulk is also researched.A conclusion is drawn that optimum water content control of bulk ore-rock is helpful for a avoiding blockage and large ore dilution in ore-drawing.