Abstract: There are a large number of diabase dikes (walls) developed in the paleoproterozoic granite body and Setula Group in the Yecheng area of Tiekerike structural belt, southwestern margin of Tarim Basin.Through detailed geological, chronological, geochemical and tectonic environment studies, the results show that the diabases belong to the subbasic lapidous basalt series, with the characteristics of high Fe, Ti, Na and low K.The chondrite normalized REE patterns show the slightly enriched of LREE, which are right-sloping distribution. The diabases enrich LILEs and relatively loses HFSEs, resembling the feature of intraplate basalts. The study of lithogenesis showed that the diabases had the characteristics of a depleted lithospheric mantle source, and were mixed by subduction fluid or melt, and the original magma source area were mainly spinel dipyroxene peridotite. Diabases were formed in an intraplate tensioning environment. The LA-ICP-MS zircon U-Pb age of (424±2.7) Ma was obtained from diabase, formed in the Late Silurian, combined with the tectonic evolution of the West Kunlun region, it is believed that this period is in the post-orogenic stage, representing the end of the tectonic cycle of the original Proto-Tethyan Ocean. Diabases contain a large amount of inherited zircon, the first group inherits the zircon age of (2242±19) Ma, which indicates that there is a Paleoproterozoic crystalline basement in the Tiekerek block, and the second group inherits the zircon age of (1842±42) Ma, representing the magmatic and tectonic records of late Paleoproterozoic Tarim Craton.