Based on the summary of correlative domestic and foreign researches in the field of contaminant transport in groundwater, the progress of the co-transport of colloids and contaminants in the porous media of saturated groundwater is expounded. The basic process and mechanism of colloid migration are discussed. The modes, influencing factors, experimental analysis and model structure of contaminants-colloid-microbial (biocolloid) are explored. The main problems in the field of the existing research and prospects of the research trends are also pointded out. The prospect of the research trend in this field is also proposed.