A detailed structural analysis of related planar and linear structures indicates that Jinzhou ductile shear zone was actually a gentle?dipping strike?slip shear zone with dextral sense of movement. Structural series of mylonitic foliation—minor folds—boudinage and pinch?and?swell structures—S?C fabrics together with extensively distributed stretching lineation in the belt was recognized to be the result of combination of two strain paths，the coaxial and the non?coaxial，with the latter occupying dominant position in the bulk non?coaxial progressive strain regime of the shear zone. Mylonitic foliation，the earliest planar structure，penetratively developed throughout the zone，played an important role in the formation of many other structures. The bulk of shear strain γ had a direct relationship with the extent of mylonitization. Sheath folds，the classic indicator for non?coaxial shear，were found in places where γ≥10. γ also led to changes of microstructural mechanisms：increasing of γ led to quartz deformation changing from low?temperature crystal?plasticity to plastic deformation and recrystallization，while mica minerals from shape orientation to viscous grain?boundary sliding.