Abstract: Due to stages of tectonic movements,deep sediments of Paleozoic in the Northern Jiangsu Basin have been completely transformed.Based on field geologic survey and underground geophysical data,geologic-geophysical comprehensive interpretations have been done.Paleozoic deep in the basin can be divided into 2 layers presently and is not totally inheritant.Combined with destroyed ancient accumulations regionally,it is suggested that tectonic ways should be used in marine petroleum explorations in the region.