Abstract: Leidong depression is situated in the stable, isolated, close and high geothermal geological setting, with fairly good source rocks, reservoirs, traps and cap rocks. The hydrocarbon was in favor of generation, gathering and preservation. The total hydrocarbon producted is *-**×10⁸t, the total gathering is ****×10⁴t. In addition, the exploration and development condition is favorable due to it is near shore, with shallow and smooth bottom. So, the oil and gas exploration is worth making progress in this area.