Communication experiments of free space optical system which was laid on the vibration platform were implemented. In the communication experiments, the transmitting terminal is static and the receiving terminal is laid on the vibration platform. The vibration platform was used to validate the performance of the APT (acquiring, pointing and tracking) system. The analytic results of experimental data prove that the APT system can effective restrain the destabilization of laser beam caused by the vibration platform. The communication distance is 3.4 km and the communication rate is 2.5 Gbps.