One kind of locomotive state of roads simulation test organization, is equipped with a test unit, as soon as this test unit presses the cylinder including a crown stay, to suppose in the crown stay presses sliding seat of pressure of cylinder axis crown the cylinder, one diagonal to extend on rollers pressure cylinder, as well as a connection composes pressure of cylinder axis as well as the sliding seat between the servo flowing tubing head pressure cylinder swinging group institute, before implementation examination work, rides first rides the locomotive to measure in the road surface records the state of roads, will measure that records the value input “the state of roads simulation software” middle, actuates the crown stay to press the cylinder and on rollers pressure cylinder stretches out or shrinks into, then carries on to the wheel axle or the tire pushes high, lags behind,Will proceed, in the future direction to pull directs, to simulate above the locomotive chassis each stress strain, the acceleration, the wheel axle the lower position to move to and so on with actual to ride rides the locomotive in the rugged road surface time the value approach, will then examine the chassis the durable security.