A vibration simulation system based on a voice coil motor and a piezo electric actuator is designed.It can be used to simulate the beam jitter which is caused by the airborne vibratio n in the free space optical communications.The simulation system can take advantage of the voice coil motor and the piezoelectric actuator,and its angular resolution is 1μrad.When the beam isn′t amplified or compressed, the jitter amplitude of the beam is 124mrad.Results show that the correlation coefficient between the simulated pow er spectral density function of the altair unmanned-aerial-vehicle (UAV) and the test result is 0.93.The vibra tion simulation system shows its excellent performance in simulating the vibration characteristics of the airborne platform ,and can provide an important guidance for the design and optimization of the tracking and controllin g system in the free space optical communications.