A method of spontaneous synchronization based on a continuous variable quantum key distribution (CV-QKD) system is proposed. This method can effectively overcome the disturbance effects which are generated by the environment in the transmission process of continuous variable quantum. The scheme realizes the synchronization between the sending terminal and the receiving tevminal. The mechanism of this synchronization scheme is introduced theoretically, and then the feasibility of this synchronization scheme is verified based on a continuous variable quantum key distribution system. Based on the experimental data, the key performance indicators for this synchronization scheme such as required time and successful probability are analyzed.