A one-year indoor soil column simulation experiment was conducted to study salt dynamics in soil (0~40 cm layer)of silt loam with different groundwater conditions.The obtained results show that electric conduct ivity of the soil(EC₀)is in positive correlation to groundwater salinity under the condition of groundwater table ranging from 85 cm to 105 cm.When the groundwater table is at 155 cm,salt accumulation of the soil columns in 0~40 cm layer is much less intensive and varies slightly in intensity regardless of the difference in groundwater salinity.In order to evaluate the effect of groundwater table and salinity on EC₀,a statistical model was built.Deeper analysis of the law of the dynamics of soil electric conductivity has eventually led to the set-up of models about EC₀ dynamics(after mineral groundwater influenced EC₀ evidently).