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Aiming at the problems of lack the dynamic signal simulation, existed in DS-SS system of TT&C multi-target mission,through the analysis of the principles about multi-target measurement and control missions based on spread spectrum technology, combining the using of multi-target simulator, a testing and commissioning condition is built up and a design of dynamic signal multi-target TT&C system based on STC89C52RC single-chip computer technology is successful developed and applied in an actual. The system can have the better capability to change the attenuator value according to the controlling file and offers a new way to simulate the flight target dynamic signal in space. It is proved that the system effectively improves the checking ability of tracking equipment dynamical performance and base band inter-symbol anti-disturbance performance according to the results of several experimental missions.