In order to utilizing the warning resources effectively, deeply analyzes the task assignment of anti- Tactical Ballistic Missile (TBM) warning by satellite and ground radar. The assigning rules are put forward; the decision-making model is established based on the task assigning. Combined with the fact of ATBM warning task, the solving method is given, which bases on the decomposing of task and PSO. The simulation result shows that the method accords with the fact of anti-TBM warning, and it can deal with the task assigning effectively.