The ship form of finite draft, which minimizes the wave-resistance for a given displacement, is calculated by the aid of the electronic computer. The ship is assumed to be wall-sided. The result gives the optimum distribution of doublets over the center-plane, which replace the ship hull. After a slight modification of the curve of distribution at both ends, the doublet distribution determines the curve of sectional area, so as to minimize the wave resistance. It determines also the optimum coefficient of fineness, e. g. prismatic coefficient, as a function of Froude number. Another calculation is made to minimize the wave-resistance, when the moment of inertia of the water plane with respect to the transverse axis through the mid-ship section is fixed. The result gives the optimum curve of sectional area, when the coefficient of fineness is different from the optimum value.