This paper mainly discusses the study method and distribution pattern of thetectonic stress field during the formation of petroleum accumuiations in the Qiao-kou oil field and the controlling effects of the tectonio stress field on the tecton-ic system, sedimentary ststem and generation and distribution of oii and gas.It is proposed that the NNE-trending major structures cantrolled the formationand distribution of oil and gas in the study region, and favorable petroliferousareas have been predicted.