Abstract: With the improvement of exploration degree,the difficulties in exploration of Lujiapu depression becomes bigger and bigger.In recent years,the exploration in Lujiapu depression was in the downturn and wandering stage.Through structure recognition and reviewing of drilled wells,the relationship between the volcanic activity and hydrocarbon accumulation has been found out.Starting from structure evolution,reservoir characteristics,hydrocarbon migration and accumulation analyses,the space matching relation between igneous rock and hydrocarbon accumulation of Yixian and Jiufotang formations,and the effect of volcanic activities on the hydrocarbon accumulation in sedimentary basins have been discussed.The main controlling factors of the igneous rock in Yixian and Jiufotang formations,the tuffaceous sandstone reservoir in lower member of Jiufotang formation have been respectively discussed.The analysis therefore can provide guidance for Lujiapu depression in the next exploration.