Through qualitative and quantitative analysis of the specimens hydroextruded, we explore the effecis of the technology parameters on the rules of the metal-flow deformation. Visioplasticity method is applied to numerical analysis of tubes(or rods). Based on the results of numerical analysis, it is noticed that there is considerable tensile strain in the inner wall of the billet near the inner side of the outlet of the die. The place and the form of fractures are discussed. In analysing some groups of specimens with variable parameters, different materials and different heat-treatment techniques are used. It should be pointed out here that rules of axisymmetric laminal flow of metallic billets hydroextruded are dependent upon the material and mechanical boundary conditions. Such flow rules have influenced not only the stress fields of the deformation zone of billet, but also the distribution of residual stresses of the tube. The optimization of the parameters is also discussed.