Abstract: A system and method for acceleration of a flying object, preferably with large take-off mass is described. The system can accelerate an object with a mass of several hundred thousand tons. The system includes the use for object acceleration of free (for the period of direct acceleration) energy of exhaust gases of the system elements' jet engines, pushing-out force of water, force of Earth's gravity, initial movement energy of the compressed spring and vacuum, lifting force of light gases, as well as energy consuming, for the period of acceleration, action of the system elements' jet engines, gunpowder gases and drives. The system and the method include acceleration of an object simultaneously in several systems accelerating one inside the other with the summation and increase of acceleration speed. The main elements of the system: launch barrel, carrier and booster pistons with jet engines, and pushing the pistons support.