Abstract: In this paper we have analy zed the data of mobile geodetic defo rmation across faults along northern section of North-South seismic belt and its both sides, and studied the activity lev el, dy namic ev olution and relation to st rong earthquakes of every fault zone. The results show that the average of fault movement rate is 0.19mm/a alongno rthern section of North-South seismic belt and its bo th sides. The fault activity has been in the lower level since Quaternary period. Regional fault activity st reng thening is an important symbol for occurrence of strong earthquakes. There is afeature that fault anomalous activity migrates from the outlying zone to the epicenters before strong earthquakes. Southwest Huashan-Liupanshan fault zone is the potential region of strong earthquake occurrence in the nea rfuture.

Key words: Fault movement rate, Seismicity, North-South seismic belt