Abstract: Reasonable stope structure parameters and oredraw management can acquire better index of ore loss and dilution indicators，and the shape of drawn-out ore and rock is particularly important for optimizing stope structure parameters and oredraw management.In order to study the relationship between water content (water content ω is 0，4% and 6%) in the shape of draun-out orebody in an iron mine in Xinjiang，physical similarity simulation experiment of single ore drawing is carried out with ore-rock materials taken from underground stope of the mine.The experimental results show that:①the water content in ore-rock has little influence on the shape of drawn-out orebody along the drift，but with the increase of water content，the proportion of top ore on the amount of ore drawing is increasing；②in the vertical direction of drift，when there is no water in ore-rock，the shape of drawn-out orebody is close to an ellipse，which indicates that the effect of ore drawing is good；when ω is 4%，compared with other conditions，the underpart of the drawn-out orebody is narrow，which indicates that it is difficult to draw side ore at this time；when ω is 6%，arch blockage of ore occurs many times in the process of ore drawing，which leads to abnormal shape of drawn-out orebody；③reducing the water content in ore-rock bulk is beneficial to the continuous and smooth drawing of ore-rock granular of muckpile in non-pillar sublevel caving.

Key words: Underground mining, Non-pillar sublevel caving, Single ore drawing, Shape of drawn-out orebody, Water content, Physical similarity simulation