Rivers play an important role in the source-sink system, and their sediments are the key entry point for the provenance analysis of the source-sink system. The U-Pb age of river detrital zircon has been widely used in the study of drainage evolution, provenance tracing and source-sink. However, the factors influencing the U-Pb age distribution of fluvial-detrital zircons in high latitudes and their representation in provenance tracing studies have not been fully evaluated, which may lead to inconsistent results and further affect the establishment of source-sink systems..In this paper, the Jilin section of Songhua River was selected as the research object, and a total of 780 zircon U-Pb ages were analyzed from 6 river sediments, and quantitative constraints were applied by inverse Monte Carlo model.The results show that the zircon U-Pb age distribution mainly has three peaks: 2500Ma, 250Ma and 180Ma, and the age distribution pattern of zircon changes significantly from upstream to downstream.Among them, the proportion of zircons with characteristic age of 2500Ma from the northeast margin of North China Craton in the upper and middle reaches has decreased significantly, suggesting that the increased contribution of new provenance in the middle reaches has diluted the provenance signal in the upper reaches, and may also be related to the interception effect of Fengman Reservoir.The contribution proportion of the northeast margin of the North China Craton in the middle to lower reaches continues to decline, and the contribution of the Songnen and Zhangguangcai Range blocks increases, indicating the addition of new provenance during river transport.In the main stream of the Songhua River, a large number of zircon particles smaller than 250Ma brought by the Nenjiang River dilute the age characteristics of the second Songhua River zircon at 2500Ma.In the study of source-sink system, the provenance signals in different river reaches are different, and even the provenance signals in the upper reaches may be missing in the lower reaches, so there is some uncertainty in using detrital zircon age data from river estuaries or a single sample to represent the provenance information of the whole catchment.In addition, the peak age of the Jilin section of Songhua River is in good agreement with the tectono-magmatic thermal event of the eastern Central Asian orogenic belt. 2500Ma May be the record of the consolidation of the North China Craton microlandmass, and 250Ma and 180Ma are in response to the closing of the Paleo-Asian Ocean and the subduction of the Paleo-Pacific plate, respectively.This study is of great significance for understanding the sourcing-sink process in the Jilin section of Songhua River, and also provides important reference value for tectonic events in Northeast China.