中、下扬子区广为发育的前缘逆向倾滑，后缘正向倾滑和两侧为走滑断裂所限的薄皮层块构造，系挤压和拉张作用处于同一运动系统中，是由岩石的物质分层、能量分层和构造分层作用及层滑运动所致。地壳表、浅层分布的层块构造与深层的块片构造、地体构造和板块构造的倾滑、走滑机制是一致的，并与断裂力学中的滑开型、撕开型和位错构造中的刃型位错、螺型位错的力学机理和运动本质是相同的 In the middle and lower Yangtze area, there are well-developed reverse slippery front, positive dip slip in the trailing edge and thin craton blocks limited by strike-slip faults on both sides, which are in the same movement system as the squeezing and stretching action By the material stratification of rocks, energy stratification and structural stratification and stratification due to movement. The crustal surface and shallow distribution of block structures are consistent with those of deep block, tectonic and plate structures. They are consistent with the slip-type, tear-off type and dislocation in fracture mechanics The structural dislocations and screw dislocations have the same mechanics and motion essence