It is concluded by drill cores observation and thin sections identification that the intrusive rocks in the North Jiangsu Basin are mainly composed of diabase and few lamprophyre，whose mineral and lithological features，logging response and seismic reflection characteristics are obviously different from sedimentary rocks. Based on statistical data of drilling and logging，combined with result of 3D seismic data interpretation，the distribution of intrusive rocks have the following characteristics：(1) vertically，the most important horizon is the Paleocene Funing Formation，secondly， the Eocene Sanduo and Dainan Formation；(2) the thickness of a single layer is generally from several meters to several dozens meters；(3) there are three intrusive types，including bedding intrusion，cutbedding intrusion and along fault intrusion；(4) horizontally， the distribution area of the intrusive rocks is more than 1000 km2，which are widespread in the Gaoyou sag and the Jinhu sag with the shape of dish or string of beads. In the North Jiangsu basin，the distribution of Cenozoic intrusive rocks are related to deep faults，meanwhile，the intrusive rocks have important influence on reservoir accumulation. It is worth to pay more attention to study the Cenozoic intrusive rocks in the North Jiangsu basin.