In view of the current surface ship formation of threat facing the air, On the basis of the influence of various factors air defense capability are calculated, established evaluation of air defense combat capacity in surface ship formation based on fuzzy theory. According to the surface ship formation air defense operations process set up a corresponding evaluation index system, using the principle of the weighted average was chosen by the calculation of evaluation factors, at various levels of membership functions of the fuzzy relation matrix and its composition and analyzed with practical example. The results show that the method can will different surface ship formation of air combat with evaluation value unified said out, the maneuverability is strong, the results intuitive and clear.