Abstract: Iron ore engineering will lead to serious soil erosion,because it's waste residue and area are large. While the programme of water and soil conservation is drawwed up,the amount of soil erosion need be predicted. The whole amount of soil erosion comprises constructing and servicing period soil erosion amount. The method of prediction usually has experience formula and analogy.The loss of water & soil of iron ore engineering is made by disturbing the earth's surface and erosion amount leading by discarded soil. Finally, prediction of soil erosion amount about a specific iron ore engineering during constructing and servicing period is analysed.