Through a study of modern and ancient deltaic depositional system in faulted basin of eastern China, the authors analysisze the geometry and genesis of sandbodies and lithofacies of deltas and proposed the main architectural elements of terrestrial deltaic deposits. As the analysis is the key content for a reservoir geological model, on the basis of the reservoir geological model of the deltaic system in the faulted basin of eastern China, the authors analysize the features of its structural types and true connotation of a reservoir geological model.