Yindian-Malong(Yin-Ma for short)ductile shear zone is an important boundary fault in the southern Tongbai-Dabie orogenic belt. The fine study of its structural deformation will be helpful to further understand the way of evolution and process of the Tongbai-Dabie orogenic belt. In this paper, the detailed field work was carried out in the Yindian and Malong area. The strain ellipsoid axial mean rate of 1.69 of the rocks in the Yin-Ma shear zone is calculated by the finite strain measurement, and the strain intensity decreased with the distance from the center of the shear zone. The analysis of the tectonic stress field find out the shear stress state that the maximum compressive stress σ1 is in the NNE-SSW direction, corresponding to the maximum tensile stress σ3 is in the NWW-SEE direction. The results of rock finite strain and stress field shows that the collision-generated extrusion force decomposed the components parallel to and perpendicular to the shear zone. Zircon U-Pb ages of mylonite in the shear zone are in the age distribution of 172～137 Ma which suggests the Yin-Ma shear zone activity epoch is mainly in Middle Jurassic to Early Cretaceous, to the end of Yanshanian period.