Recently some researchers made attempts to make clear the effect of shapes of frame lines on wave making resistance. It is obvious that we can not obtain any informations about it from the Michell's thin ship theory. Then, the authors developed a method to estimate approximate source distribution over the hull surface by making use of the slender body theory, and show that the result obtained by this method, for the model of Series 60 ( C_b =0.60), agrees with the three dimensional solution calculated by J. L. Hess and A. M. O. Smith. They also calculate the wave making resistance of the ship represented by this source distribution, and the stream lines around a ship hull, which are compared with the experimental results. In this procedure each transverse sections of the ship is approximately represented by Three-Parameter sections.