The current tracking methods based on the anterior cusp of an aircraft have a problem of unstability and low damage probability. To solve this problem, an aircraft tracking method based on the points of interest is discussed. By using this method, an aircraft can be tracked stably and may not be lost and hence the aircraft damage probability can be improved. In this method, the sin-coding is used to convert the infrared gray level images into the false color images firstly. Then, the temperature fluctuation region between the anterior cusp and the engine of an aircraft is obtained. Finally, the center of the region is used as a tracking point so as to complete the terminal guidance of a missile to the aircraft.