The optical detection system works in the mode of passive infrared detection,and when the system works in normal condition,all the infrared heat sources on the ground may be detected as targets because of the large temperature differences between them and the surrounding environment.To solve this problem,we studied several commonly used data association algorithms,built up a mathematical model for the clutter problem,and made simulation to the algorithm through Joint Probability Data Association (JPDA).The results show that the algorithm can effectively remove the flicker noise,and solve the interference problem caused by the heat sources on the ground.