Abstarct: There is a variety of equipment in power plants, aerospace and petrochemical industries, where creep is likely to occur. The creep phenomenon is a slow deformation that may cause equipment to rupture, break, and disintegrate. Therefore, it is important to study these stresses due to the efficiency of components and equipment. The most widely used of these equipments in today's industries are cylindrical and spherical shells. FG materials, whose properties change functionally, due to the continuity in their mechanical, thermal and magnetic properties, their stresses and gradients become continuous, which strengthens the material. In this study the behavior of steady state creep in thick_walled cylinder made of unhomegons FGM Under the effect mechanical loads an radial temperature gradient are studied by using the Billy-Norton low. steady state creep of thick_walled cylinderical shells made of functionally graded materias subjected to mechanical loads an radial temperature gradient