Abstract: The contact and restitution features of a simulated magnetic head/disk system in the presence of impact disturbance of a single degree of freedom were investigated with a testing device developed. The relationship between the coefficient of restitution of bouncing vibration, contact time of spherical simulating magnetic head, and input velocity under different loads, was analyzed. The results show that the coefficient of restitution increases with the input velocity decreasing at a relatively low load. It decreases with the input velocity decreasing at a relatively high load. The contact time decreases with the input velocity decreasing at both low and high loads, but the decreasing magnitude at low load is larger than that at high load. The coefficient of restitution and contact time of the simulated spherical magnetic head are relevant to the load, input velocity and the characteristics of the lubricant film. And the bouncing vibration can be suppressed by increasing of the load and proper choose of the lubricant.