In order to realize the rapid automatic measurement of the linear guide, a method for discrete measuring the profile accuracy of the linear guide, which was based on the laser triangular displacement sensor, was proposed. In this method, the laser triangular displacement sensor was used to scan the profile of each section of the linear guide rail, then corresponding algorithm was designed to process the data of each section contour and the error generated during the measurement process was calibrated. After that,the contour of the guide section was transformed into the center coordinates and radius of the circle which was used to get linear guide raceway radius, distance between the central axis of the raceway and parallelism of the central axis of the raceway with respect to the reference plane of the linear guide. Finally, the feasibility and stability of the measuring method was validated by designing a standard round bar measurement test and linear guide crosssection measurement test.