Based on the developed three-segment model with inner dynamometric suspension frame，the vortex-induced vibration (VIV) and the corresponding vortex-induced forces (VIF) of preliminary design deck of a long-span cable-stayed bridge were measured through wind tunnel test with aeroelastic section model. Through the analysis of VIV under 0° and +3° wind attack angle，the dynamometric model was proved to be effective for measuring aerodynamic forces on bridge deck. In addition，the recorded displacements and forces of VIV under different wind attack angles were compared，and the varying curves of VIV frequency，phase difference between force and displacement as well as the work applied by VIF in lock-in range were also discussed. The results show that the dynamometric model can measure the aerodynamic forces simultaneously when the model is vibrated. Furthermore，for the lock-in range，the VIF frequencies were the same as displacement frequencies，and the phase difference between VIF and displacement increased with the wind speed growth，while the work applied by VIF demonstrated the trend of increasing firstly and then decreasing.