Taking a solvent contaminated site in Jiangsu Province as a case study, the impact of groundwater contamination on the surrounding groundwater was studied by using hydrogeological risk assessment model for land contamination in the UK. The contaminants migration process from source to site boundary can be simulated under the conditions of natural attenuation. The simulation results of the groundwater solute transport using Ogata Banks, Steady-state Domenico and Time variant Domenico models were compared. The results showed that the concentrations of benzene, ethylbenzene, chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, and chloroform exceeded the III grade of the groundwater quality standard, but the groundwater surrounding the site has negligible environmental risk. The Ogata Banks and Domenico models' simulation of the migration of contaminants under the natural attenuation of the aquifer showed that the concentration of contaminants decreased rapidly during the migration process within 30 m, and the concentration of pollutants was low and the attenuation was not obvious during the migration process outside 30 m. The Domenico model is relatively simple and advantageous in the application of risk assessment. Sensitivity analysis showed that the hydrogeological parameters, such as migration distance (x), aquifer bulk density (ρ), aquifer porosity (n), organic carbon content (f_oc), organic carbon distribution coefficient (K_oc), hydraulic conductivity (K), and hydraulic gradient (i), could affect the natural attenuation migration process of contaminants in the aquifer, thus to improve the accuracy of risk assessment results, the abovementioned parameters need to be obtained through refined hydrogeological investigation.