Finger' decrustation, ageing and the image error caused by living fingerprint sensor may affect the imaging quality of fingerprint easily. In order to solve the problems which exist in the inferior quality fingerprint image, such as line breaks, the adhesion of ridge and valley as well as the regional blur caused by finger decrustation, a method based on the analysis of fingerprint image energy is proposed. The algorithm has analyzed and calculated the intensity field, gradient field, directions field and the frequency field of fingerprint image, and then unified the concrete information as well as the principle of Gabor filter to enhance the fingerprint image progressively. The practice indicates that the whole set of algorithm has better enhanced performance and can improve the image quality distinctly.