Abstarct: In this study, by investigating a heterogeneous thick-walled spherical shell FG under mechanical load and radial temperature gradient by the plane elasticity theory, the relations related to the steady state creep have been extracted and the results obtained from analytical solution using finite element method in software Abacus has been compared. The pressure in the inner wall is uniform and also the temperature in the inner and outer wall is constant. To derive the equations using the solution of the Prandtl-Ross equation and using the relations, the strain compatibility, stresses and equivalent creep strain rates are analyzed. The results obtained from the analytical solution are in good agreement with the finite element solution.