Abstract: Decollement structure has big effect on the occurrence, thickness and depth of coal seam, particalarly on coal mining. This paper illustrates the application of 3D-seismic exploration technology in nicely depicting decollement structure by taking the decollement structure interpretation of one district in Henan Province, discusses the recognition feature of decollement surface on the time section and 3D data cubes, explains that 3D-seismic is an effective detection means for decollement structure.