Abstract:The Jinchuan mine is a large copper and nickel deposit,and the mine district No.2 is one of the key deposits of the Jinchuan nickel mine. At present,this district goes into the deep mining. The drifts are strongly deformed and severely damaged by deep mining. In order to study stress state in deep mining,geostress survey is carried out in mine district No.2. In-situ stress measurement is carried out by hollow inclusion gauge method,and three-dimensional stresses at seven measuring points are obtained. The measurement results show that at the depth 700 to 800 m from underground,the maximum principal stress is about 20 to 30 MPa. For most of the measuring points,the maximum principal stresses are in the direction of NNE-NE,and the dip angle of them is above 40°;and the stress state governed by the horizontal stress changed obviously.