Based on 1/50,000 regional geological survey, the field geological characteristics, petrology, geochemistry and zircon U-Pb chronology of the volcanic rocks of the Manitu Formation in Chabuqiri area, Inner Mongolia were systematically studied by using the triple mapping method of "volcanic structural-lithofacies-volcanic stratigraphy", and the formation age, petrogenesis and regional tectonic background of the volcanic rocks of the Manitu Formation were analyzed.The Manitu Formation in Chabuqiri area of Inner Mongolia is divided into two lithologic segments, one consisting of pyroclastic sedimentary rocks and the other of neutral volcanic rocks, which constitute a complete sedimentation-eruption cycle. The volcanic facies are divided into eruption-sedimentary facies, exhalation facies, clastic flow accumulation facies, cave-fall accumulation facies and volcanic passages. Circle four V-class volcanic institutions; The LA?ICP?MS zircon U?Pb age of the andesite of the second member of the Chabuqiri manitu Formation is 157.8±1.4Ma, indicating that the formation age of the andesite is Late Jurassic.