Abstract: Calculations of fuzzy image feature field were studied, the scene matching algorithm adopting similarity metrics of image fuzzy sets was proposed, and the matching methods of combining multiple similarity metrics of fuzzy sets were explored. Further more, the scene-matching algorithm of the fuzzy synthetic similarities (FSSM) was proposed. The simulation results show that the FSSM algorithm has advantages of excellent adaptability, high matching probability, and good real-time ability. As an excellent algorithm of scene matching, it can be used for the real-time positioning of aircrafts.