A method for identifying a fingerprint image includes inputting a fingerprint image captured by an electronic device, calculating an amount of valid ridge pixels in an amount of total ridge pixels of the fingerprint image to generate a first ratio, calculating an amount of successive ridge pixels in an amount of total ridge pixels of the fingerprint image to generate a second ration when the first ratio is identified within a first predetermined range, and determining the fingerprint image as a valid fingerprint image when the second ratio is identified within a second predetermined range.