In this study the plane wall jet under the self-preserving pressure gradient was measured to investigate the effect of the ratio of the maximum velocity U_m, to the external stream velocity U_e on the turbulent quantities. Velocity ratio U_m/U_e was set at three values within the range of 2.0 to 4.0. Under such conditions, three components of turbulent intensity and Reynolds shear stress were measured by using two linearized hot wire anemometers. The turbulent flow is closely self-preserving in the range of 57<x/S₁<162. However, the turbulent quantity profiles for each case may differ depending on the velocity ratio. The absolute value of each turbulent quantity in the inner layer decreases with decreasing velocity ratio ; conversely, in the outer layer, it increases. Several characteristic scales nondimensionalized with an excess velocity U₀ for both inner and outer layers have the same tendency independent of the velocity ratio.