Abstract: | Starting from the Bethe-Slapeter equation, the coupled equations for the bound states of the deuteron may be reduced to the ordinary three dimensional ones and the number of the components of the wave function is decreased by using the approxima-tion of the instantaneous interaction in the center of mass system. The wave functions of the deuteron are expanded in terms of the spherical and the vector spherical har-monics and the radial coupling integral equations are obtained. Some properties of the deuteron wave functions are discussed also. Qualitative estimations indicate that the relative ratio of the probability of P wave to that of S wave is about the order of(1/2)|(p/m)|2 |