Abstract: On the basis of comparision of the distribution of intensity for two earthquakes occur ring in the Liyang area with a magnitude of 5.5 (Feb.22,1974) and of 6.0 (Sept.9,1979),it has been found that the principal axis of their magistoseismic area is in a WNW-ESE direction and the shapes they take are not in agreement with the isoseismal lines.In this paper,the writer has suggested that the disagreement of this sort may be explained by the widespread distribution of the basement soil characteristic of muddy quality mild clay in the eastern part of the epicentral area.Four categories of the basement soil have been presented according to characterized soil.Quaternary sediments and underground water table and the like.The writer has attempted to investigate the distribution of intensity and to reconstruct the map for intensity distribution for the purpose of elimination of site-related effect on intensity distribution and of emphasis on underlying role of structures when putting various intensities that are situated in four categories of basement soil under the same classification (Ⅲ).It has been concluded that the distribution in point is strictly dependent on those faults where earthquakes may attend and that there is a tendency to the same direction shown by intensity isolines for highly harzard area and magistoseismic one.