Distributed Aperture Fully Coherent (DAFC) radar is a kind of new and overturning technology, which can achieve synthetized signal processing for N 3 Signal to Noise Ratio (SNR) gain and break the limit of power-aperture product of radar. Due to the long distance between units of the satellite radar system, the wireless phase estimation and synchronization become one of the key problems. A theoretical model of distributed radar phase synchronization is established in this paper. A new phase synchronization method in the circular way is also proposed based on phase error analysis. Compared with Principal-Subordinate method, it eliminates the restriction on center junction in DAFC, and improves the anti-interference ability and the robustness of the algorithm. The simulation results validate the effectiveness of the proposed method.