The echo complexity of different air targets at different angles is determined by the influence of the photon detection mechanism and the diversity of the target structure and material. Using the photon detection echo theory, this study proposed the concept of photon echo posture affect levels to describe the photon echo of target attitude sensitivity. This method was verified using the modelling and simulation data, quantitative research on the susceptibility of three typical air moving target attitudes, comparison between their characteristics and differences, and experiments. The results show that the obvious difference in the influence level of the photon echo attitude of similar and dissimilar air targets can be used to distinguish the target, providing a new method and data support for target recognition with high theoretical and application values. The other angle range and specific application conditions of the theory for characterising air target movements need to be further discussed.