The Guandi—Zhaijiagou geological section of Linxi Formation in Linxi County and the Taohaiyingzi geological section of Linxi Formation in Ar Horqin Banner are the typical sections in the north part of Northeast China. The age of the sections is late stage of Late Permian according to the newly found conchostracans, pollen and spores. The Linxi Formation consists mainly of black and grayish black sandstone and slate association, with the sandstones being mainly feldspathic litharenite and siltstone. The deposition age and provenance of Linxi Formation have not been accurately defined. In this paper, the feldspathic litharenite(TH01) in Taohaiyingzi area and siltstone (2GD002) in Linxi County were taken as dating samples. New research from Linxi detritial zircon by the SHRIMP U Pb dating showed that the zircons analyses gave six 206Pb/238U age populations: 256.2±2.5Ma~276.4±2.4Ma(N=20),327.2±2.6Ma~363.7±3.5Ma(N=2),415.0±3.5Ma~481.1±4.4Ma(N=8),531.4±3.8Ma~577.5±5.0Ma(N=2),598.9±6.0Ma~974.6±7.8Ma(N=6),1049±11Ma~2606±7Ma(N=4，207Pb/206Pb age)；The weighted mean 206Pb/238U ages of sample TH01 and 2GD002 are 260.7±1.2Ma (MSWD=1.13, N=13) and 262.6±1.9Ma (MSWD=1.6, N=7), respectively; and the youngest ages of dating zircons are 256.0±2.5Ma (TH01) and 257.9±2Ma (2GD002). Combined with other studies in the study area, the authors have come to the conclusion that the maximum depositional age of the Linxi Formation is 253~257Ma and the minimum depositional age of Linxi Formation is 238~242Ma. The peak ages of 260Ma and 262Ma are consistent with the magmatic events of the collisional suturing and collage between the North China platform and the Siberia plate. Comprehensive study on the basis of other scholars in Linxi Formation, this result provides reliable evidence that the deposition of Linxi Formation extended to the early Triassic, and the continental collision between the northern margin of the North China plate and the Siberia plate along the Solonker—Xra Moron—Changchun suture took place at early Triassic.