Main controlling factors for the development of deep buried reservoirs in the Bohai Bay basin are discussed on sedimentation, diagenesis and other related factors. Besides the influence of sedimentation, low geothermic gradient, high deposition rate, high heating rate, high hydrocarbon generation intensity and overpressure are main factors for the formation of anomaly high porosity intervals in deep buried reservoirs of the Bohai Bay basin, because they affected the course and intensity of diagenesis. The relatively high porosity and high permeability intervals were best developed in the Huanghua depression, and second in the Liaohe depression, and worst in the Jizhong depression.