Based on the analysis of rock, structural style, kinetics and kinematics of the B.Nakhan shear zone in the pakhan region in xayaburi, Laos.this paper considers that the strain type of the shear band is mainly based on the extruded strain of K < 1, indicating that it is formed in the extrusion environment. Belt tectonic rock mineral composition is given priority to with green schist facies, deformation temperature is 250℃~ 300℃, the mutiperiodic activity into a low-temperature greenschist facies type right-l...