We scrutinize the approximate analytical solutions by the optimal homotopy analysis method (OHAM) for the flow and mass transfer within the Marangoni boundary layer of power-law fluids over a disk with suction and injection in the present paper.Concentration distribution on the surface of a disk varies in a power-law form.The non-Newtonian fluid flow is due to the surface concentration gradient without considering gravity and buoyancy.According to the conservation of mass,momentum and concentration,the governing partial differential equations are established,and the appropriate generalized Kármán transformation is found to reduce them to the nonlinear ordinary differential equations.OHAM is used to access the approximate analytical solution.The influences of Marangoni the number,suction/injection parameters and power-law exponent on the flow and mass transfer are examined.