Recent works on structural analysis of the Dandong ductile shear zone indicated that in terms of path description, both of the coaxial and non-coaxial deformations were involved in the progressive deformation within the shear zone. Moreover, spatially random distribution of the path types gave rise to deformation partitioning, and accordingly, subdivision of deformed rocks in plan. There was also an alteration of strain path during progressive deformation. The microstructures should be one of the most important tools for analysis of deformation regime. The field observation and strain analysis confirmed further that the deformation partitioning took place on different scales within the ductile shear zone, under bulk shear strain (non-coaxial) regime, coaxial deformation always preponderantly occurred in protomylonite, whereas in mylonite and ultramylonite, the non-coaxial type dominated. Progressive deformation led to an evolution from coaxial to non-coaxial strain, with the dominant position of the latter throughout the shear zone ultimately.