Abstract: This research made use of system of PIV (Particle image velocimetry) that advanced measuring technique of fluid field to perform exact highly measurement in the case of not interfering with fluid field. Namely, it use optical astigmatism of the particle in the fluid to record the site of particle at different time. Accordingly, it will require the replacement of particles and measure the absolute velocimetry of water in the centrifugal impeller passage and volute, software is used to process the data and the blade-to-blade distribution of the total relative velocities from suction to pressure side is abtained in the centrifugal impeller passage. It provides reliable theory basis for design of centrifugal pump.

Key words: Centrifugal pump, Measuring of fluid, System of PIV