±800 kv high voltage transmission line project from Shanghai temple to Shandong province needs to cross the Shenghong iron ore mining area. Shenghong iron mine has not yet been constructed. It has yet to determine the distribution of underground iron roughly depending on the survey report. In order to analyze the tower foundation deformation of the high voltage transmission line caused by iron goaf, the paper adopts Flac3D software to simulate the process of iron ore mining and filling. The main conclusions are: (1) Excavation of the sloping iron mine causes the surface final vertical displacement a "parabolic" distribution and the horizontal displacement curve a "horizontal s" distribution. (2) During the excavation, the maximum subsidence offsets to the goaf slowly. In the influence range of the excavation, the trend of the parabolic in the incremental interval is almost consistent with the trend of the iron. The shallower depth of the iron, the smaller depth of the surface it could cause. The horizontal displacement shows symmetrical distribution on both sides of the iron. The horizontal displacement curve changes from "straight line" distribution to "parabolic" distribution slowly, and finally shows in "horizontal s" distribution. (3) The surface vertical displacement and the horizontal displacement at the location of the tower foundation are very small, the maximum different vertical displacement and different horizontal displacement satisfy the requirement of the standard.
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