This paper presented a structural modal parameters identification by Fast Independent Component Analysis (Fast ICA) rapidly and accurately. The method builds the objective function based on the independence between the modal responses, and separates the structural output signals by Fast ICA based on the objective function, and gains the structural modal shape vectors. Then structural frequencies and damping ratios are gained by Hilbert transform, a single mode analysis technical. Finally, the efficiency and robust of structural modal parameters identification by Fast ICA presented herein was verified by a six-story frame structure.