The slamming problems of the three-dimensional bodies are investigated analytically. The similar method of flat plate approximation developed by Wagner to solve the two-dimensional slamming is applied to the water entry problems of arbitrary axisymmetric bodies. The theoretical approach is extended to the more general case where the shape of the impact surface is elliptic. An analytical expression for the three-dimensional pressure distribution is derived. It is shown that the maximum impact pressure is approximately proportional to the square of the expanding velocity of the major diameter of the elliptic wet surface.