The disturbance, aroused by sun-tracking drive of solar array, has become one of the major barriers for improving the performance of high-precision spacecraft. With the aim to obtain the regular characteristics of this disturbance, the solar array and the drive assembly were considered as a couping system and an electromechanical integration model and a dynamic simulation program are presented based on the major aspects of main driving steps and the Simulink software platform.. The correctness was verified by comparing the experiment results, and the effects of solar array rigid-flexible coupling and the centroid bias to disturbance characteristics were analyzed. The results indicate that the rotation speed fluctuation can activate low order torsion modes of solar array, and disturbance spectrums include both frequency characteristics of motor driving and structure vibration, but torsion vibration has little effect on rotation angle. The centroid bias of solar array can motivate translational-rotational coupling vibration, activate out-of-plane bending modes, change the distribution of disturbance spectrum, and increase the amplitude of disturbance.