Abstract: Cifengchang-Yazihe structure is the thrust unit of middle section of Longmen Mountain anterior area adjacent to the east margin of Tibetan plateau. There were plenty of perdu hydrocarbon tectonic traps in its footwall, and it's the very important exploration destination on the hill side of foreland basin. By applying the geometry deformation methods of modern tectonics，we built up the structure deform types and assemble style of Cifengchang-Yazihe seismic exploration area from the deep subterranean to the ground，so does the corresponding structure mode. By means of geologic profile forward modeling technique，we validated the rationality of the structure mode, represented
the process of structure evolution happened in the anterior area of middle section of Longmen Mountain. Using visible computer mapping techniques, we analyzed the three-dimensional charac-teas of two dimensional seismic work area, and built the three-dimensional mode.

Key words: anterior structure of Longmen Mountain, structure modeling, 3-D structure analyze, fault related folding, balanced forward modeling geologic profile