One of the best approaches for modeling large deformation of shells is Cosserat surface but the finite element implementation of this model suffer from membrane and shear locking specially for very thin shells. If the director vector is constrained to remain perpendicular to the mid surface, during deformation, locking will be prevented. This constraint is in fact a limiting analysis of the Cosserat theory in which Kirichhoff’s hypothesis is enforced. It has been considered for the first time. Simo’s plastic approach is modified to implement the constrained director. This model includes both kinematic and isotropic hardening behaviors. A consistent elasto-plastic tangent modular matrix is extracted. Numerical solution is performed by interpolation of displacement on the whole domain and a hierarchical finite element scheme is developed. The principle of virtual work is used to obtain the weak form of the governing differential equations and the material and geometric stiffness matrices are derived through a linearization process. The validity and the accuracy of the method are illustrated by numerical examples. Keywords: large deformation; thin Cosserat shell; plastic; constrained director