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LU ZAO-XUN XIA HUAI-KUAN(Seismological Bureau of Liaoning province, Shenyang 110031)  
The geoscience transect is located in Northeast China. It extends from Englehobol (45°28'N, 115°39'E) on the China-Mongolia boundary in the west to Dagushan Town (39°53'N, 123°38'E) on the shore of Huanghai sea in the east for 960km in total length in northwest trend, passing from east to west through two first-order geote-ctonic units, the Sino-Korean platform and Nei Mongol-Dahinggan Ling fold system. Moreower, the transect also cuts across the Haicheng M = 7.3 earthquake area and hence is a representative geoscience transect in Northeast China.The deep synthetic geophysical exploration, geological survey and comprehensive research which have been carried out along the geoscience transect reveal that the structure of the crust and upper mantle of the transect possesses obviously the characteristics of longitudinal stratification and transverse zoning which reJlect a different evlution periods of geological tectonics of Sino-Korean platform and Nei Mongol-Da Hinggan Ling fold system, the plate boundary and intraplate tectonics and their features.This paper elaborates a special deep tectonic environment of such areas as Haicheng seismic region and Chaoyang-Yixian County as well as Xer Moron He in which the earthquakes are more active.
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