A series of prolonged granitic intrusions occur along the foliation of the Longquanguan ductile shear zone. Petrological and structural characteristics show that they are possibly syn-deformational granites resulting from partial melting of the country rock caused by shearing. The electronic microprobe dating of monazites from these granites shows that the major deformation episode took place at 1 877-1 846 Ma, the second deformation episode occurred at 1 812- 1 782 Ma, and the fluid activities happened in the late stage at about 1 725 Ma. The major deformation of the Longquanguan ductile shear zone occurred synchronously with the tectonic events in the central zone of the North China craton in the Late Paleoproterozoic, and this shear zone seems to have been one of the main shear zones formed by the collision of eastern and western blocks.