In order to safely recover the security ore pillars in Sanxin Gold Copper Mine and ensure the stability of filled stope,theoretical calculations were conducted on the reasonable filling body strength in the stope.Numerical simu-lations were performed on the stope stability under different filling body strengths (cement-sand ratio) to determine the reasonable range of filling body strength.The results indicate that the required strength of the filling body in the stope is mainly related to the length of the stope and the height of the filling body.For security ore pillar stopes with lengths ranging from 20 m to 60 m and a height of 40 m,the filling body strength needs to be above 3.5 MPa.The surrounding rock displacement should not exceed 2 mm,which falls within the allowable range specified by design standards,ensuring safety.