Abstract: In order to research the influence of internal dumping on stability of end-slope in open-pits，the theory of end-slope timeliness and internal dumping with burying slope were analyzed.The displacement of the point in end-slope was studied，and the variation of safety factor with the model which was built by FLAC3D.Profit evaluation was made combining with Yimin open-pit.The results showed that：It reduced the exposure time and increased the safety factor of end-slope with the internal dumping following up，and also it can create respectable economic benefit.

Key words: Surface mine, Internal dumping, End-slope, Stability