To study laws of oil and gas accumulation in K1n1 in main central depression zones of Haita basin，based on analysis of oil and gas distribution law，the control effect of fault-trap source rock，fault and potential on oil and gas accumulation in K1n1 in main central depression zones of Haita basin was evaluated comprehensively and quantitatively by analyzing the spatial relation between oil/gas distribution，source rock，fault and potential. The result indicates that the control effects of source rock，fault and potential on oil and gas accumulation in K1n1 in main central depression exist in the following three areas：①areas of source rock control faults-enclosed oil/gas accumulation and its distribution areas；②early-extensional faults provide sealing conditions for faults-enclosed oil/gas accumulation；③low potential areas control the position of faults-enclosed oil/gas accumulation. The comprehensive evaluation value for control of source rock，fault and potential on oil and gas accumulation in K1n1 of main central depression zones in Haita basin should be more than or equal to 2.63. According to this，favorable areas for oil and gas accumulation in fault trap of K1n1 in main central depression zones of Haita basin were predicted. They distribute mainly in sandbodies of fan delta front in Surennouer，Wudong slope of Wuerxun sag，Sudeerte of Beier sag，east sub-sag of south Beier sag and central sub-sag of Tanan sag；followed by the sandbodies of fan delta front in Hunouren of Beier sag，east sub-sag of Tanan sag.