This paper mainly describes the preliminary results of deep crustal structure in north-eastern Shanxi Province and its vicinity from 3-D gravitational forward and backward calculation with the help of geological and regional gravity data. By 3-D normal calculation, the residual gravity at various depths is obtained, then, the plane distribution of crustal thickness in the whole region is inversed using the given depth of Moho. Based on the results above, the ‘top-deep’ varia-tion of some active faults and structures is simply discussed. In addition, the deep crustal tectonic background of the earthquakes and the Quaternary volcanic activities is studied. It is also found that there maybe exists a shear tectonic belt at depth along 40°N.