Abstract: As the most advanced testing technology of fluid mechanics fine flow field measurement, SPIV technology can visualize the three-dimensional motion of complex flow field, and its application in experimental teaching can improve students ' interest in learning. The experimental teaching platform visualizes the rotating flow field. Through data acquisition and image post-processing analysis, the three-dimensional velocity field of the rotating flow field is obtained. Finally, it is observed that the circumferential velocity of the rotating flow field is a rotating motion with faster rotation speed and higher uniformity of distribution along the axis, which increases from the central axis of the tube to the wall. So that students can understand the development of advanced flow field testing technology while exercising hands-on ability and thinking ability, improve learning outcomes.