Abstract: A solution method of guided wave dispersion equation in the fluid-filled pipe is presented based on evolutional programming. The evolutional programming is introduced into the solution of pipe dispersion equation with energy attenuation, and it controls the evolutional process only with saltation. Compared to other solution methods, the solution method of dispersion equation based on evolutional programming is more convenient. The velocities measured during the NDT of fluid-filled pipes based on magnetostrictive guided wave were shown to be well matched with the velocity curve calculated by the presented method.