Abstract: 【Objective】The Well HT 1 in the main concave drilled a set of sand in the third member of the Dongying Formation and obtained industrial oil, which is an exploration breakthrough in the main concave. But the source direction and spatial distribution characteristics of the above sand are not clear, which restricts the further exploration.【Methods】In order to trace the source area and construct the source-to-sink system, detrital zircons LA-ICP-MS U-Pb dating was launched. 【Results】The dating results showed that the detrital zircons ages scatter in four age ranges: 100-160 Ma, 240-300 Ma, 1680-2000 Ma and 2300-2600 Ma with obvious age peak between Jurassic and Cretaceous (100-160 Ma), while the detrital zircon ages in Cangxian uplift were characterized by an obvious peak in Permian (240-300 Ma) , indicating the source area is not the Canxian uplift. The northern Yanshan orogenic belt has magmatic rocks from Archean to Mesozoic, among which the Mesozoic magmatism was widely distributed with obvious age peak of 100-160 Ma.【Conclusions】In general, the detrital zircons age pattern of the sandstone from the Ed3 is similar with that of the magmatic rocks in the Yanshan orogenic belt, indicating that the source area of the sandstone in the Ed3 is in the Yanshan orogenic belt. Based on the above results, the "remote sand supply, trench sand transportation and deep concave deposition" sedimentary modle is constructed for the sandstone in the Ed3, which provides implication for the future exploration.