Based on the structural interpretation and fault system of Qingnan subsag，the fault evolution and tectonic styles were analyzed in detail. The effects on hydrocarbon source rock evolution，reservoir development and controls on hydrocarbon accumulation were studied. The results show that Qingnan subsag began to build up during the sedimentation of Kongdian Formation while multi-phase faults with directions of NW，EW and NNE developed due to the interaction of stretch of the Dongying sag and the strike-slip mechanism of TanLu faults. As a result the extensional tectonic style，the extensional tectonic-strike-slip style and strike-slip style developed in different evolutional stages and controlled the tectonic evolution，thus bring on its specification and complication. The tectonic evolution controls the evolution of hydrocarbon source rocks and the development of reservoirs and cap rock. Excellent source rock of Es4 developed in Qingnan subsag；the littoral and shallow lake bars developed widely in Qingnan subsag are the main oil and gas entrapment to form bar and shoal reservoirs in Es4 that are mainly tectonic and tectonic-lithology type.