A new formulation of t h e self consistent model has been applied t o predict the plastic behaviour of A1-Li Alloys. This model enables t o take into account simultaneously the crystallographic texture, the morphology of grains, the internal stresses evolution and the anisotropy of intracrystalline hardening. Microscopic observations and analyses of crystallographic textures are used t o constitute t h e d a t a for the self consistent scheme. As results of such calculations, we present t h e variations of plastic properties versus the angle between the tensile axis and rolling direction. Initial Yield point, macroscopic hardening modulus a s well a s transversal plastic flow a r e examined. The direct comparison with experimental results is given. A satisfactory agreement with numerical results is observed.