To measure the two-dimensional velocity vector distribution of the flow field, a method of crossed tagging and displaying to conduct velocity vector measurement based on hydroxyl tagging velocimetry was developed. In this technique, the tagging laser beam and the displaying laser sheet are intersected to form tagging spots for flow tracing. Compared with the traditional cross-grid method to realize velocity vector measurement, this method uses a simplified experimental light path, which is advantageous to application in harsh environments. Moreover, the tagging spots are approximate dots, which are more convenient for identifying the tagging positions. Through the simulated tagging spot images, precise values of the signal noise ratio, spot size, and tagging shape were obtained. The velocity and fluctuation in a jet flame were obtained by a single tagging spot, and the velocity uncertainty can reach 2.2 m/s while an OH background is present in the flame. By using a cylindrical lens group to shape the tagging laser beam into multiple lines, 3×20 tagging spots were formed to measure the velocity vector distribution in the jet flame.