Abstract: In order to study the influence of hanging mine by non-pillar sublevel caving method on stability of open pit slope, the crack-growth process and the evolution process of the first principal stress in the slope of an iron hanging mine mining in Hubei are analyzed in conditions of different slope inclination, orebody dip angle and ore burial depth, The results show that the fall of loose rock mass volume increases with the increase of slope inclination and buried depth of orebody.With the increase of the orebody dip angle, the volume of the loose rock mass of the collapse is the trend of increasing first and then decreasing.When the orebody dip angle and ore burial depth under certain conditions, the mined out area cannot fully accommodate the loose rock mass when the slope angle is greater than 40 degrees.With the determined slope inclination and ore burial depth, the mined out area cannot fully accommodate the loose rock mass when the orebody dip angle is less than 30 degrees.