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To meet the requirement of bit error probability test of telemetry when shipboard TT C system aligns the offset dipole, and make a further step in building a dynamic radio frequency signal environment for joint debugging and testing, a dynamic control system is designed in offset dipole on shipboard TT C radar system. The numerical control attenuator can be controlled by manual or automatic at SMCU, which located in the long-distance antenna central body.It can achieve that amplitude change of RF signal in offset dipole received by radar antenna pointing to the sky, and offer a new way to simulate the flight target dynamic signal in joint debugging,which help to analysis effects of the tracking performance in the system. Since the system has been verified in maritime track and control tasks, it is proved that the design method is scientific and effective, the operation is convenient and rapid, and the working is stable and reliable. With this system, the performance of equipments can be tested sufficiently and the efficiency of preparing tasks can also be improved.