Since short distance of submunition initiated in sequence under water may cause sympathetic detonation and affect its working ability, after analysis of data of a dispersal experiment, distance distribution of submunition was acquired.Specifically, mean value of distance of non-adjacent submunitions is greater than that of adjacent ones obviously, the greater the difference of tier number is, the greater distance of two submunitions is between two tiers.According to the conclusions above, better order arrangement of submunition in the same tier and among different tiers in cargo projectile was proposed.The new arrangement is beneficial to decrease the possibility of sympathetic detonation and damage of mechanical structure and circuit after dispersal, thus, increasing the probability of submunition working properly.