Grain-size distributions has been widely used in the identifying the grain-size components of the lake sediments,but few researcher have been applied this method to identify the grain-size components of the gully sediments whose sources include both wind erosion and water erosion.In this study,the grain-size components of the Douliugou gully sediments were determined using a Weibull distribution function.Douliugou gully is one tributary of Yellow River and is located in the Inner Mongolia.There are four possible grainsize components of of Douliugou gully contain,i.e.