Abstract: The Yihuang area lies in the contact zone between the low grade metamorphic series of south central Jiangxi and the medium and high grade metamorphic series of Wuyi. 1∶50 000 regional survey has confirmed that the two metamorphic series have the same protolith formation and deformational history. Their metamorphism is characterized by “gradational transition in space and progressive evolution in time”, implying the entire process of the Caledonian orogeny from generation→development→elimination.