The working slope Angle directly affects the stripping amount and production stripping ratio. Increasing the working slope Angle can reduce the advance stripping amount, reduce production stripping ratio, save transportation distance and reduce production cost. However, while improving the working slope Angle, it is necessary to pay attention to the "two quantities" of the open pit to ensure the continuous and stable production of the open pit. This article takes the Hongshaquan open-pit coal mine as the engineering background to study the relationship between the working slope angle and the changes in advance stripping amount and production stripping ratio, and combined with the actual production conditions on site,. the scheme of realizing steep slope mining of working slope is put forward. The results show that when the working slope Angle increases by 2°, the advance stripping amount decreases by 9.67Mm3, and the production stripping ratio decreases by 0.22; When the stripping step is combined in pairs, the working slope Angle is increased to 12°, the production stripping ratio can reduce to 2.7, and the "two quantities" of the open pit will be guaranteed.