Aiming at the problem that the matching function of sensor to target is difficult to determine in multi-sensor,multi-target association,a sensor assignment method was given.It was proposed that in the scenario of the actual early warning detection combat,the matching ability of sensor to target was decided jointly by collaborative coefficient between the sensors,information value function and information cost function.Through the analysis and comparison of the sensor detection ability and existing target information,the matching value of sensor to target was calculated out.Then,taking the maximum comprehensive efficiency of the sensor-target association as the objective function,the assignment model applicable to early warning detection was established.Finally,the simulation result verified the rationality and effectiveness of the proposed method,and showed that the association scheme is simple and feasible.