The Permian volcanic rocks widely distributed in the northern margin of the Tarim Basin are of great significance for understanding the late Paleozoic tectonic evolution of the Tianshan orogenic belt. The research object of this paper is the tuff of the Balikelike Formation in Halajun area, the geochemical, chronological and Lu-Hf isotope studies have been carried out, which show the tuff is rich in silicon (SiO₂=74.59%~76.18%), high alkali (7.48%~7.79%), low aluminum (Al₂O₃=13.80%~14.29%), belonging to calc-alkaline peraluminous rhyolites; enriched in LREE, relatively depleted in HREE, with weakly positive Eu, relatively enriched in large ionic lithophile elements (LILE) such as Rb and Th, and depleted in high field strength elements (HFSE) such as P, Nb, Ta, Ti, the average Nb/Ta ratio is 16.60, the average Sr/Y ratio is 2.42, and the average Mg^# value is 34.71. LA-ICP-MS zircon U-Pb geochronology shows that the crystallization age of the Balikelike Formation tuff is 280.47±2.58 Ma, the εHf(t) value is from -0.73 to 2.12, and the second-stage model age (t_DM2) is 1 318~1 145 Ma. Combined with the early Permian tectonic evolution, magmatic rocks and sedimentary distribution characteristics of the northern margin of Tarim, it is pointed out that the Balikelike Formation was deposited in the intraplate rift basin where the oceanic crust of the South Tianshan subducted to Tarim Basin, with non-orogenic intraplate magma, which is the partial melting of ancient crustal materials under the action of lithospheric mantle and mantle plume, inheriting the dual-source characteristics of crustal and mantle sources.