© 2022, Shiraz University.Pre-aerated two-phase flow characteristics of a B-type hydraulic jump over a sloping channel were experimentally investigated in a stilling basin of a physical model for a relatively high Froude number of Fr = 5.41. Local values of void fraction, interfacial bubble velocity, and air bubble frequency were measured by a double-probe fibre-optical instrumentation system in the air–water flow region. The measurement range was varied from upstream of the jump toe to the stilling basin end-sill. The experimental data were analysed with regard to inflow conditions and internal two-phase flow parameters such as local void fraction, interfacial velocity, and air bubble frequency. Analytical solutions given in the literature are compared with experimental data in terms of void fraction and vertical velocity distribution along the sloping channel sections of the B-type hydraulic jump.