Abstract: In order to verify the feasibility and deformation capability of the intelligent material structure in the study on aerodynamic characteristics of the flexible variable trailing edge wing, the videogrammetric model deformation technique is used to measure the deflection of the trailing edge in the transonic wind tunnel, and the dynamic process of deflection is recorded. The pressure distribution on the upper wing surface is also measured. The Mach number is between 0.4 and 0.8, and the model's angle of attack is between 0° and 6°. The influence of flow condition on the structure deformation is analyzed. The test result shows that the flexible structure of the model can bear the aerodynamic load of the transonic flow and achieve the deflection. When the driving force is constant, the deformation is influenced by the Mach number and the angle of attack. The increase of Mach number weakens the deformation ability of the intelligent structure, which leads to the decrease of the deformation speed and the decrease of the trailing edge deflection angle. The influence of the angle of attack is more complex, and couples with the influence of the Mach number. The higher the Mach number, the stronger the influence of attack angle. Finally, through the analysis of the pressure distribution, it is concluded that the flow separation is the key factor to influence the deformation capacity of the intelligent material structure.