An indoor soil column simulat ion experiment was carried out to study salt dynamics in silt loam with different groundwater depths and salinities.The results obtained show that groundwater depth and salinity are both dominant factors affecting salt dynamics in soil profiles.Under condition of the same groundwater depth, when soils at the same depth reach dynamic equilibrium of salt, there is not able difference in soil solution salinity that is in positive correlation to groundwater salinity.Under condition of the same groundwater salinity, velocity of salt accumulation is in negative correlation to groundwater depth, but soil solution salinities at the same depth in different soil columns are similar after the soils there enter into dynamic equilibrium of salt.In order to value the effect of groundwater depth and salinity on salt dynamics, the models were built.