///Taking Xiadian VII-branch orebody as an example, the authors studied regional structure, fracture characteristics of VII-branch structure, structural feature of dioritic porphyrite and structural features of orebody. The results show the compounding phenomenon of the new, old structural system of VII-branch structure. And the authors point out that the same structural system is obvious, which shows the incorporation of the structural features, among which, multiperiodic activities of metallogenic fractures, multiple changes of structural properties, multiple superimposed ore-forming processes are main factors for forming orebody, the orebody is formed in the junction of NEE VII-branch structure and near-SN vein rock, the low order NNE, NEE structures are main host structures.