In 1927 year

8 magnitute earthquake occured in the Gulang region. Present

medium-strong earthquakes occur frequenty. This paper introduced the basic character of tectonic land-form

circular struture and main linear structure based on the interpretative result from the Landsat images

air-photos and field investigation.This paper also discussed indally the seismo-tectonic environmnt （M≥4） and pointed out the relation between the seismic occurence and the deep-seated structure

circular structure

main acive faults zone and net rift of linear structures. Most epicentres are controlled by the cross points of netted linear structures in the region.