In the present work, the processes of charge transport and electron transfer in dye-sensitized solar cell (DSC) under the stable illumination or forward bias were discussed, and the frequency response characteristic to the small perturbation of the light or voltage in DSC was also interpreted. The electron transit time and electron lifetime were investigated by electrochemical impedance spectroscopy (EIS), photoelectrochemical impedance spectroscopy (PEIS), intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS). The time constants determined by different measurement techniques were compared. The results showed that the process of charge transport and electron transfer has no significant influence on the time constants under low bias or low light intensity, and this process affected predominately the electron lifetime under high bias or high light intensity.