By multi-radar coherence-synthetic detection, distributed aperture coherence-synthetic radar cleverly solves the contradictions between the radar great power detection and mobility, which has the advantage of strong survival ability, high cost-effectiveness ratio, high angular accuracy, strong expandability and easy realization, and so on; it can also be used in the air defense and anti missile, precision measurement and space target monitoring and other fields, suitable to the vehicle, shipborne, airborne, bombs and other platforms. The design of distributed aperture coherence synthetic radar system is more complex than traditional radar. The design consideration factors and design criteria from the radar number selecting, baseline length selecting, frequency selecting and other side for the distributed aperture coherence synthetic radar system are given. The distributed aperture coherence synthetic radar system topology is presented and the design of coherence synthetic target detection processing is proposed. Through the coherence synthetic detection experiments carried out on the aircraft and satellite targets by the radar prototype and radar equipment, the correctness of the distributed aperture coherence synthetic radar system design and the project feasibility are verified.