The northern slope of Gaoyou sag develops diabase intrusive body generally. The relationship amongdiabase invasion period, oil and gas migration time and trap forming time affects oil and gas enrichmentregularity and pool-forming model directly. According to the comprehensive analysis of regional tectonicmovement character and evolution, diabase invasion character and the relationship between diabasedistribution and fault, it suggests that the tWo sets of diabase developed in northern slope of Gaoyou sagare both the product of Sanduo event Also we discuss the relationship between diabase invasion andpool-forming. The northern slope of Gaoyou sag develops diabase intrusive body generally. The relationship among diabase invasion period, oil and gas migration time and trap forming time affects oil and gas enrichment regularity and pool-forming model directly. According to the comprehensive analysis of regional tectonic movement character and evolution , diabase invasion character and the relationship between diabasedistribution and fault, it suggests that the tWo sets of diabase developed in northern slope of Gaoyou sagare both the product of Sanduo event also we discuss the relationship between diabase invasion andpool-forming.