Since decoy target is hard to find by seeker, harmonious wave seeker is used to recognize the decoy target. Based on the target's movement trajectory, harmonious wave ballistic trajectory coefficient recognition model was derived. Target's harmonious wave ballistic trajectory coefficient was simulated according to different targets. The outputs of simulation show that the comparison of coefficients can distinguish difference between real target and fake target in air. It is proved that harmonious wave radar seeker has practicability in the field of target recognition, it lays a foundation for application of radar seeker by harmonious radiation model.