Nerve conduction test is a noninvasive method to find some possible malfunction of a peripheral nerve to conduct action potentials between stimulation and observation points by observing the compound action potential after stimulation. To obtain the basic method to estimate the effect of composition and shape of a limb to the test results, compound action potential produced on the surface of a cylindrical limb was simulated using boundary element method. The produced potential wave had a typical shape of a compound action potential and conducted at rational velocity.