Based on torsional motion-induced device with programmable vibration frequency and amplitude，the time history of wind pressure and displacement for each measurement point on the high-rise building model surface was measured by synchronous multi-pressure sensing system in wind tunnel test. The identification method of structure torsional aero-elastic effect was derived. The torsional aero-elastic effects of rectangular high-rise buildings with different wind speeds，amplitudes and stiffness eccentricities were evaluated. The test results show that the torsional aerodynamic stiffness is negligible，but the torsional aerodynamic damping should be taken into consideration. Especially，when the wind speed reaches the critical wind speed，aerodynamic damping decreases rapidly and comes into negative aerodynamic damping.