Effects of impulsive change in pressure gradient in a two-dimensional turbulent channel flow have been experimentally investigated. The rapid change of pressure gradient was accomplished by passing an expanded region. Reynolds shear stress and the statistical properties, i.e., integral length scale, skewness/flatness factors and turbulent diffusions, were investigated in the relaxing region behind the expanded region. An organized structure was examined using conditional sampling techniques. Mean frequency of the bursting was obtained using the VITA Technique. The contributions to uv in the four quadrants on the u-v plane were examined by means of the quadrant analysis method. Reynolds shear stress decreases in the near-wall region, and increases in the outer region. The frequency of the bursting decreases with the pressure gradient. The contribution of the ejection to Reynolds shear stress decreases in the near-wall region, and increases in the outer region due to pressure gradient.