Weibei Sag was a strike- slip pull- apart basin, which formed by the strike- slip actives of the Tan- lu fault, and the strike- slip actives played an important role on the evolution of fault system, the formation of the traps, and the hydrocarbon accumulation in Weibei Sag. During the sedimentation of Kongdian formation, Weibei Sag successively experienced sinistral strike- slip and right- lateral strike- slip, the characteristics and development of the fault in different tectonic evolution stage showed significant difference, and the multi- strike- slip activities caused the formation of three weak strike- slip belts in the east part of Weibei sag. Meanwhile, the the multi- strike- slip activities also leaded to the formation and evolution of massive traps of different types, so the oil&gas could accumulated in them. In addition, the activities of Tan- lu fault controlled the hydrocarbon accumulation in Weibei Sag. Macroscopic view, oil&gas migrated to the southeast and accumulated in the Zaohu nose structure belt, which was uplifted according to the strike- slip activities. In microscopic scales, due to the strike- slip rotation- shearing actions, the oil and gas migrated from west to east along the tensile fault in east- west direction, and sealed by the strike- slip fault in south- north direction. Corresponding to the three weak strike- slip fault belts, the planar distribution of oil and gas in Kongdian formation showed characteristics of “extend in east- west direction” and “zonal distribution in south- north direction”. The middle & north part of the middle weak strike- slip fault belt is the key exploration direction for Weibei Sag at present, and the west weak strike- slip fault belt could to be the study area for tight stone reservoirs and shale oil and gas.