When the Jiaojia Gold Mine is mined by the downward approach filling mining method,the blasting in the ore body has a great impact on the filling body next to the approach.A two-dimensional planar model is established by LS-DYNA software.Its external dimensions are 5.5 m×3.0 m,of which the ore body part is 3.5 m×3.0 m,and the filling body part is 2.0 m×3.0 m.A row of boreholes is established in the ore body,a total of 4,the borehole diameter is 42 mm,the hole spacing is 0.8 m,and the borehole distance from the filling body is 0.5 m.The effect of blasting on the filling body is simulated under the condition of the presence of filling bodies on one,two,or three sides of the ore bodies in the process of the downward approach filling mining method.To thoroughly study and understand the influence of different hole margins on the filling body,the failure range of the filling body under different hole margins is also simulated to obtain the effective stress change law in the filling body and the failure range in the filling body.The results show that the stress wave propagates faster in the ore body,while the stress wave in the filling body propagates slower than in the ore body;with the gradual increase of hole margins,the failure area of the filler caused by blasting rapidly decreases.In actual production,the rupture depth and crushing effect of the filling body should be fully considered,and the blasting hole margin of the mine using the downward approach filling mining method should be controlled at 0.3-0.7 m.