Based on the propagation theory of paraxial approximation for optical beam, the analytical expression of the optical electric field is derived for the dipole vortex beam during propagation. The intensity distribution on the observation plane is obtained at the same time. It is shown that the obliquity of the dipole cores of the beam will change during propagation. While the topological charge is bigger, the center of spot on the observation plane tends to be a circular macula; while the off-center parameter is bigger, the center of the spot on the observation tends to be a rectangular bright spot. Further analysis on the extremum of the intensity reveals that if mw20>d2, there exists seven extreme points of light intensity on the observation plane; or else there exists five points.