Dimensional variation and assembling orientation of submunition with centroid excursion affect radial centroid excursion of cargo projectile.To analyze it, the effects of dimensional variation of submunition on ultimate centroid excursion of submunition was analyzed by Solidworks firstly.Then, the effects of assembling orientation of submunition with centroid excursion on radial centroid excursion of cargo projectile was analyzed using Monte-Carlo method.Submunitions obeyed different mass distribution and centroid distribution were assembled in the cargo projectile in different orientations and the radial centroid distribution of cargo projectile was calculated.To effectively decrease the radial centroid excursion of cargo projectile, the centroid excursion of submunition must be reduced when submunition was assembled in certain orientation, while it needn't to be specially controlled when assembled in random orientation.