In choosing the site for an important construction project, we must knowthe activity of faults within or surrounding the factory area, which seems tobe one of the major bases for evaluating antiseismic capacity of the constru-ction project.Based on the relationship between the seismic reflection layer and thestratigraphic horizon, the author used the shallow seismic reflection methodto investigate active faults during the siting of important construction projectsin such cities as Beijing, Dingzhou and Handan. The results obtained haveyielded fairly good geological effects and thus provide reliable data for evalu-ating antiseismic capacity of the construction project.