Abstract: Particles transport plays an important role in contaminants transport in groundwater. In this study, the case of red mud pond in Zhatang is taken to analyze the distribution characteristics and transport law of red mud particles by means of combining site sampling and laboratory analysis. The results suggest that red mud is a kind of back-fill material that is similar to clay with well-graded. The distribution characteristics of red mud particles tend to be consistent at different sampling depths. There are differences in the transport law of red mud particles between various particle sizes. Hydrodynamic conditions play a decisive role in the maximum particle size of red mud particles in transport process.