When the infrared radiation from a target and its background is not different greatly, the target can not be recognized accurately. To locate the target accurately and destroy it, an idea that a seven-element infrared array is used to scan the target is proposed. The experimental results show that the position of the engine in a target can be recognized accurately by utilizing the infrared characteristics of the target. According to the engine positions in typical targets, the targets can be classified and their critical parts can be recognized and destroyed.