Following the theory of the first report, the author tries to obtain the second approximation of the velocity potential of an infinite draft ship with parabolic waterline. The theory encounters mathematical difficulties from which seems to result the unfavourable conclusion except the diminuation of the wave profile and the wave resistance curve. These difficulties will be play an unimportant role in lower speed so that we may introduce an approximate relation of the wave resistance in such speed. He tries to compare thus obtained formula with the correction formula which is used by many authors, and finds out that those factors will be related closely to the wave height at bow and stern.