The deep structure features around the Tancheng M8? earthquake in 1668 has been analyzed in the paper． On the basis of the crustal velocity structure of seismic traveltime tomography，especially the low velocity layer of middle crust and Moho depths，we scanned the deep velocity distribution in the area of 34° ～ 36°N，118° ～ 119°E along latitude，longitude and deflection direction，and located the area with the feature in agreement with the deep structure features around the Tancheng M8 earthquake in 1668． The location is 34. 8° N ～ 35. 2° N， 118. 2°E ～ 118. 7°E． The suitable location is 35. 1°N，118. 6°E with a depth of 20km．