The range of study in this thesis involves mainly the northern area of the East Qinling Mountain (i.e. it was called the Earth’s Axis in the past). The Authors have discussed mainly the characteristics of rock assemblage, primary rock formation, petrochemistry, geochemistry and their structures from the Qinling complex and Taihua complex. We have proposed that the Qinling complex was the block derived from the crystalline basement of North China Fault Block, owing to subdution of the lithosphere fault-block of South China with oceanic crystal sea areas beneath the south margin of North China Fault Block in Middle Proterozoic era.Kuanping complex and Taowan complex were products of the marginal-sea basin with oceanic crust at it’s base, which formed in process of southward drifting of the Qinling complex block. The marginal-sea basin was closed after Jinning movement. Then the early orogenic belt of North Qinling formed.