Dongwu movement is an important crustal movement activity happenning during the Permian, but arguments focus on its location, character and occurring time. Especially in Longmen mountain area, there are few people done any research. Recently some geological surveys were made in Longmen mountain area combined with the fruit of predecessors. Based on the analysis about absence of formation, unconformity relationship, sedimentation and distribution of the igneous rocks, this paper discussed the Dongwu movement in Longmen mountain area. Ample evidences include absence of top formation of Maokou Formation; the pervasive unconformity between Maokou Formation and Longtan Formation; the abrupt change of lithofacies and the eruption of volcanos. The occurring time is from early to middle Later Permian, which coincides with the sedimentary time of Longtan Formation. Dongwu movement is a vertical movement result of crust, and terminated with the outbreak of the igneous rocks in northern Longmen mountain. The movement is also signified the termination of sedimentation of sustained platform from early Permian, and made lithofacies differentiated in Longmen mountain area.