在秦岭海盆于印支期关闭、褶皱推覆隆起后的燕山期陆内俯冲、地壳急剧缩短过程中，在先期近东西向大型断裂参与下，由于秦岭、华北陆壳上地壳的强烈挤压，南秦岭各断块以中地壳低速层为主滑脱推覆面向扬子陆壳逆冲、仰冲，北秦岭各断块则沿低速层向秦岭陆壳大规模滑脱推覆，从而在东秦岭地区构成了两个向南逆冲的巨型逆冲推覆构造体系。二者均属前展式推覆类型。文章对其构造特点、形成条件及相互关系进行了详细论述． Due to the intensive crustal crustal crustal compression in the Qinling and North China basins during the recent near-to-east-west large-scale faults, during the Yanshanian intracontinental subduction following the Indosinian closure and fold-nappe uplift in the Qinling Basin, Each block in the South Qinling Mountains is mainly dominated by low-velocity crust in the middle crust. The thrusts of the Yang continental crust, the Yangshong and the North Qinling fault blocks are pushed out along the low-velocity strata to a large-scale detachment of the Qinling continental crust, Two giant thrust nappe structures thrust southward. Both are pre-rollout types. The article discusses its structural features, forming conditions and their relations in detail.