More detailed absorption transitions of C 60 in the UV/visible region are observed from the third order derivative absorption spectra. The spectra are fitted with Lorentzian line shapes, and the transition energies and broadening parameters are determined. The assignment of the transtions in visible region is discussed,and some vibronic modes are given. In comparison with normal absorption spectrum technique, the third order derivative absorption technique has been shown an effective method for the study of optical and physical characteristics of atom clusters such as C60.