In order to study on the influence regularities that the different dispersion initial conditions of the sub-munitions make on the dispersion distribution characteristics, this paper takes a certain cluster munitions as the research object, and the sub-munitions dispersion kinematic model is established with considering the influence that the random parameters make on the dispersion distribution. The dispersion motion regularity and the drop point distribution regularity of the sub-munitions are obtained by simulation. Selecting 4 key factors making influence on the dispersion as the dispersion height, the velocity, rotation angular velocity and pitch angle of the mother bomb, the influences exerted on the drop point distribution of sub-munitions by different initial conditions of the single factor are analyzed with the numerical simulation method. At last the influence regularities of 4 key factors are summarized.