Abstract: The transport behavior of contaminant in a subsurface system is an important research area in geoenvironmental engineering.Research work at Tsinghua University about heavy metal and LNAPLs migration was briefly introduced.Geotechnical centrifuge technique was used to model the contaminant process in unsaturated soils,and tempo-spatial concentration distribution were obtained by chemical analysis of collected soil samples.In addition,numerical simulation was employed to investigate the long term migration behavior and its affecting factors.It was shown that centrifuge could be use to simulate the transport process of contaminants,and the combination of centrifuge modeling and numerical simulation was an effective mean to study contaminant transport behavior in unsaturated soil..