With the environment in aerial defending becoming increasingly complicated, it is very important to recognize the target fleetly and exactly. Multi-data fusion provides a new idea in target recognition. Information fusion can be performed at pixel level, feature level or decision level. Dempster's rule plays a potential role in auto-recognition of target, to solve the problems in the application of the evidence Theory, this paper analyzes the principle of Dempster's rule and then discusses its limitations and amendatory measures, including amending evidence source and modifying fusion rule. Finally, the paper proposes a general method for air target identification and presents the flow chart of the identification process. Through simulation and the comparison of it with other algorithms，the results show that the proposed algorithm is more efficient and feasible.