The closure time and subduction direction of the Bangong LakeNujiang Tethys Ocean have been a matter of considerable interest and debate. Previous studies have mostly focused on the formation age of the Bangong LakeNujiang suture zone. Despite the importance of studying the remote sedimentary response in the southwest Tianshan area caused by the subduction collision of the Bangong LakeNujiang Tethyan Ocean, very few reports exist on this topic. Orogenic activity in the southwest Tianshan region was caused by subduction collision of the Bangong LakeNujiang Tethys Ocean; the southwest Tianshan orogeny uplifted and denuded the mountain as was recorded by tuffite fission tracks, mountain denudation material that was transported and finally deposited in the piedmont basin or intermountain basin producing a sedimentary filling response within the basin. Hence, the sedimentary conglomerate reflects mountain erosion caused by orogenic movement which in turn reflects the subduction and collision of distant plates. Therefore, the study of sedimentary conglomerate in the basin is an indirect study of orogeny. The gravel statistical analysis，sedimentary facies analysis，high resolution sequence stratigraphic analysis of the Kuzigongsu Formation in the Sarek basin, in the southwest Iianshan mountains was undertaken. It is proved that the provenance of the Sarek basin is divided into two directions: NNE and West，and the alluvial fan deposits into two cycles. The results show that the remote response caused by the subduction collision of the Bangong LakeNujiang Tethyan Ocean in the late Jurassic can be divided into two stages. The first stage of tectonic activity is weak; the second stage of tectonic activity was intense, which resulted in the deposition of fine, medium, and coarse conglomerates. The alluvial fan conglomerates indicate that the Bangong LakeNujiang Tethyan Ocean was subducted northward at the end of the late Jurassic. The northward subduction collision the Bangong LakeNujiang Tethyan Ocean caused uplift and denudation of the southwest Tianshan mountain.