Rocket on the Rope is a new kind of rocket trace test instrument, it uses two parallel lines to constraint rocket's movement in the pointed direction. For simulating the rocket flying process, this paper uses Newton method to construct the rope dynamic model, and construct rocket flying model according to its detail parameter variety, We uses Runge-Kutta method to simulate the rocket's movement, and ccalculate the rocket flying trace on the rope, rope dynamic position and rope stress force and so on, we also calculates rope shifts distance from its initial position in vertical direction, the result is just same as the rocket flying test result in the early day.