Abstract: The Jiaojia fault zone is characterized by ductile deformation in the early stage and brittle fracturing in late stage.The early ductile deformation have typical mylonite associations,symmetry fabrics.Finite strain measurements and estimate of differential stress value show:from Jiaojia major fault to Wangershan secondary fault,major axis ratio of deformation key-body dropped a little、K-value increased a little,the direction of differential stress is NWW-SEE trending. It is sinistral ductile deformation zone dominated by flatting at medium temperature of 300℃~500℃ and middle confining pressure of 0.27~0.49GPa in the early.