The flapping wing aircraft is a new concept-based small unmanned aerial vehicle modeled by bird flying. It is distinguished from traditional fixed-wing and rotorcrafts and its lift and thrust forces are provided by flapping wings. The aerodynamic characteristics of the flapping-wing aircraft are tested to explore the generation mechanism of the aerodynamic force of the flapping-wing aircraft in the unsteady flow field environment and the effects of the relevant parameters of the proposed flapping-wing aircraft on the aerodynamic characteristics. With the help of data provided by aerodynamic test, the work of flapping wing flight control and mechanical structural optimization can be improved obviously. This study will play a huge role in promoting the design of flapping wing aircrafts and the control quality improvement.