In the metamorphic core complex (MCC) and the metamorphic arch, Jiangxi and Hunan area, there is an obvious correlation between the late brittle fault and the early subordinate ductile structure. It is considered that extensional type brittle faults could be generated through multiple transformations from ductile foliations (S2) to cleavages and joints, and mainly owing to the tectonic deformation from compressive to tensile. The evolution mechanism is due to a lot of causes not only a tensile action of the late period in the collision orogenic deformation in the macroscopic scale, but also a direction character of the process hardening of the rock body in the microscopic scale. A new partitioning of the stress and strain in a condition of load and boundary has been synthetically analysed in the macroscopic and microscopic scales, thus it will be inevitable trend that the subordinate ductile structure can transform into the brittle fault in the MCC, metamorphic arch and collision orogenic deformation. In this research as mentioned above, there is the important significance of practice investigation both the mineral resources and the environment geology.