As the important implementation of biometric technology, palmprint verification is one of the most reliable personal identification methods. In this paper, a new approach to palmprint verification based on line feature matching and datum point invariance is presented. The datum points of palmprint which act as the important registrations, are defined owing to their remarkable advantage of invariable location. Then, the simple and efficient methods of line feature extraction and matching are proposed. Several palmprint images are adopted to test the approach and the experimental results show the effectiveness of palmprint verification.