Abstract: Volcanic rocks are well developed in the Changling Fault Depression.The lithology and lithofacies had been analysed systematically.The volcanic activity cycles of the Yingcheng Group had been divided into third and fourth cycles according the research of the evolution of tectonic cycle and the changes in intensity of volcanic eruptions;The controll process of the structure of Changling eastern area had been anatomized,and it obviously controlled the spatial and temporal distribution of volcanic rocks.The tectonic movement and later reconstruction are the main controll factors of volcanic rock traps.Fault zones are the favorable regions of volcanic reservoir exploration.