Abstract: On the basis of the annual series of data of hydrological stations in the middle and lower reaches of Liaohe River and the sediment budget methed is used to research the temporal and spatial distribution of sediment in the middle and lower reaches of Liaohe River. Study results show that the reach from Juliuhe to Liujianfang is a strong deposition district of the middle and lower reaches of Liaohe River. The correlation between the deposition amount of the reach from Juliuhe to Liujianfang and the water and sediment volume from different sediment districts in the upper reaches of Liaohe River is researched using statistical methods. The results show that the deposition of the reach from Juliuhe to Liujianfang and sediment yield of Liuhe River have a good correlation.Changes of sediment yield area of Liuhe River play a major role in controlling to changes of sedimentation volume in the lower reaches of Liaohe River and the unit water and sediment of flood season makes a greater contribution rate to the basin deposition.Therefore,in order to alleviate the problem of deposition in the lower reaches of Liaohe River, the governance of soil erosion should be strengthened in Liuhe River basin.

Key words: sediment source area , river sedimentation , the middle and lower reaches of Liaohe River