A less lethal projectile system is revealed. The less lethal projectile system includes an outer shell and a projectile. A rimfire blank mounting slot is arranged at a rear end of the outer shell and offsetting a center of the outer shell. A rimfire blank is mounted in the rimfire blank mounting slot. A firing pin of a launcher strikes an edge of the rimfire blank eccentrically to push the projectile out. When the projectile is fired and reached a target, the projectile is broken and effective compositions loaded therein is scattered. The projectile is less lethal and getting broken easily for allowing the effective compositions loaded in the projectile to be spread out within a certain range.