Particle Image Velocimetry (PIV) achieved significant development compared with traditional flowing display technology by using a transient, multi-point, non-contact hydrodynamic speed method. PIV overcome the single point measurement limitations of traditional means for that PIV can record a good deal of velocity distribution of different space at the same transient state, also provide customers affluent spatial structure and flowing characteristics about the flow field. PIV can be widely used in the wind tunnel flow field measurements, turbulent flow field measurements, particle flow studies, environmental studies, biomedical research and other fields.