Abstract: Aerodynamic data usually can be obtained through three ways: wind tunnel test, numerical calculation and flight test, each method have both advantages and disadvantages. To achieve more complete and more accurate aerodynamic data, deep comparison and acquisition of data from different ways, together with data fusion technique could be used. In the first part of this paper, the background, development, present situation and basic idea of data fusion in aerodynamics research field was introduced. Secondly, the method to establish data fusion rules was given, and two kinds of practical data fusion algorithms were presented, i.e., the fusion algorithm based on uncertainty bounds analysis and the algorithm based on aerodynamic mathematical modeling. And some engineering applications of these two algorithms were also introduced. At the last part of this paper, the application prospect of aerodynamic data fusion was introduced. This investigation indicates that the integrity and the accuracy of the aerodynamic data could be improved by using data fusion methods. However the utilization of aerodynamic data fusion needs not only the mathematics of the fusion algorithm but also the researcher’s experience, there may exist some subjective factors in the fusion results, choice of fusion method depends on the practical problems.