Abstract: The Baguashan anticline is located in the western thrust-and-fold zone of Taiwan orogen. As a whole, the growth of this anticline is from the north to the south. However, because the dips of the detachment fault along the Jinshui shale vary along the strike, which are smaller at two ends of anticline and larger in the central part, the strata deformed in the fold also vary along the strike obviously. All these result in the plan shape of Baguashan anti- cline whose two ends convex to the west and are wider than the central narrow part. Furthermore because of the controls of structural belts （ maybe lateral lamps） along two ends of anticline, the growth of the anticline is limited. In the early time, the anticline grew from the north to the south, and in the later time it grew from the south to the north. This process of growth can well interpret the plan shape, the characteristics of fold axis, and the mechanics of different parts of Baguashan anticline, so the development of the Baguashan anticline has its own special character.