The authors propose a novel method of fingerprint thinning based on the Gabor-phase image. The Gabor-phase image is an intermediate result of fingerprint enhancing, and the ridge center can be located at the discontinuities of the phase image. The authors utilize an edge-detect-like method to extract the thinned ridges from the phase image. This strategy is different from most existing algorithm which requires extra steps of image binarization so that it can improve both the efficiency and accuracy. Experimental results demonstrate that the proposed algorithm yields better thinning result in much less time.