The vertical plug is a new way to dissipate water energy, in which the flow can be regarded as a submerged jet, and the construction leads to the high velocity and pressure on the wall. In order to explore the wall pressure distribution at the impinging zone and offer some scientific evidence for structural and hydraulic design, based on a spillway project, the characteristics of the wall pressure is analyzed by theoretical derivation, experimental test and numerical simulation under the condition of submerged jet with different flow rate. The results indicate that the measured pressure on the bottom axes agrees well with the numerical one, and both results have good agreement with the theoretical curve when the ratio of the distance between the test point and largest pressure point and the length of half maximum pressure is less than 1, but they are much larger than the theory when it is more than 1. The pressure gradually tends to the theoretical curve with the increasing of distance between press-slope and the center of the jet. The half-pressure length, which does not depend on the position of press-slope at the impacting zone downstream when the distance is 2.35 times larger than the jet diameter, is nearly equal to 0.3 times the diameter of the jet. Furthermore, the pressure of the top and side wall is decreasing when approaching to the center of the jet.
