In view of the weak research on the characteristics of geotemperature⁃pressure system in the northern part of Dongpu Depression, based on the measurements of ground temperature and pressure, the characteristics of geotemperature field, geopressure field and temperature⁃pressure system in the northern part of Dongpu depression are analyzed by T⁃P system theory. Combined with the structure distribution pattern, their effects on hydrocarbon distribution have been analyzed. The study demonstrates that the temperature gradient in north part of Dongpu depression is high, the sag zone has the characteristics of deep buried and high geotemperature, which is beneficial to the maturity of source rocks and the formation of hydrocarbon in the sag zone. The deep overpressure could be as the important motivating force for hydrocarbon migration. In vertical, the T⁃P system includes static pressure geothermal⁃geopressure system and overpressure complex geothermal⁃geopressure system. The lateral T⁃P system can be divided into 5 subareas, namely, HTHP, NTHP, HTNP, NTNP and LTNP, and the low⁃energy NTNP is the place where petroleum mainly accumulates. Different from other hydrocarbon rich depressions in the Bohai bay bain, due to the development of gypsum⁃salt cap rock, a large amount of hydrocarbon has accumulated in the high⁃energy NTHP.