This paper is concerned with the wing structure and the aerodynamic characteristics of a flying dragonfly. The structural properties of dragonfly wings were studied through the measurements of some morphological parameters. The scanning electron microscopic observation showed the morphological characteristics of the dragonfly wing. Dragonflies were examined in a small low turbulence wind tunnel. In the experiment on the measurements of wing flapping, an optical displacement detector was used to measure the displacement of the dragonfly wing. In the experiment on the measurements of the velocity fluctuation, a hot wire anemometer was used to measure the velocity field. The spectrum of dragonfly flight was revealed by the measurement of velocity fluctuation.