Abstract: Based on trend surface analysis, the ore-body controlling structure and ore-body location of Daye Fe deposit is studied.The results show that① the main ore-body controlling structure is the contact zone of ore-bodies and rocks, especially the concaves which located in the intrusion controlled ore-bodies directly; ②the other structure around the contact zone, such as two groups of trace extension fracture, "X" type conjugate fracture, two groups of overprinting fracture and collapse locations of the hinge end of anticlines are also important ore-body controlling structure, ③K12-K21 in Jianlinshan is the best location of mineralization prospecting, and according to this result, 1.5×107 t iron mine were found in deep Jianlinshan.

Key words: Trend surface analysis, Ore-controlling structure, Ore-body location, Daye Fe deposit