Abstract: Particle image velocimetry (PIV) was used to characterize the fine structure of flows in a plunge pool with an oblique submerged jet, and jet velocity distributions and turbulent characteristics in the jet-plunging region have been studied systemically. The results showed self-similarity in cross-sectional profiles of velocity and turbulent intensity in this region. Peak velocity at the jet center decreased in inverse proportion to the length of jet path, while turbulent intensity and jet half-width increased linearly with the path length. Equations for jet velocity distribution and turbulent intensity distribution are given in this paper, along with empirical formulas for calculations of jet velocity, turbulent intensity, jet half-width at different lengths of jet path.