Kongtongshan Formation is nominated in Kongtongshan region of Pingliang, Gansu Province. The strata is mainly composed of thick-bedded red Conglomerate and is usually named Kongtongshan Formation Conglomerate. It has been controversial about genetic mechanism, provenance and sedimentary age of Kongtongshan Formation Conglomerate. In this paper, the authors conducted LA-ICP-MS zircon U-Pb isotope geochronologic method to analyze the age of detrital zircon from three samples of Kongtongshan Formation Conglomerate. The results show that the age spectra of detrital zircon can be evidently divided into five groups: 380~479Ma、561~1198Ma, 1285~1982Ma, 2319~2612Ma and 2714~2764Ma. Based on the age of detrital zircon features and combined with previous research results, the authors contend that the provenance of Kongtongshan Formation Conglomerate mainly from Qinling-Qilian Orogenic belt and minor from Alxa massif and Ordos Block. The sedimentary age of Kongtongshan Conglomerate is the middle to late Triassic Epoch. The Kongtongshan Formation Conglomerate should be sedimentary response of interplate Orogenic Belt rather than intraplate Orogenic Belt.