Abstract: Based on the theory of random vibration and system identification, the ambient vibration tests of the three wind turbine towers in wind-power station of the Inner Mongolia Wulanyiligeng were carried out. The method of coupling overall modeling of blade, hub, nacelle and tower was put forward, and the numerical stimulation and tests results show that the wind turbine towers can effectively avoid resonance, and meet the standard design requirements of Germanischer Lloyd. The vibrational forms of wind turbine tower mainly are lateral bending vibration, forth-and-back bending vibration and torsional vibration; the translational damping ratio in the first phrase is about 1.75%, and the torsional damping ratio in the first phrase about 0.6%. The overall modeling shows excellent consistency with the tests results, which can benefit the wind-induced dynamic response analysis and the vibration control research on the wind turbine tower system.