This subroutine provides the plastic constitutive relation of single crystals for finite element code ABAQUS. The plastic slip of single crystal obeys the Schmid law. The program gives the choice of small deformation theory and theory of finit rotation and finite strain-This subroutine provides the plastic constitutive relation of single crystals for finite element code ABAQUS.　The plastic slip of single crystal obeys the Schmid law.　The program gives the choice of small deformation theory and theory of finit rotation and finite strain