This paper utilizes the data of water and sediment and river topography after the impoundment of the Three Gorges reservoir to analyze the channel and sediment of Jingjiang river, channel scouring and siltation,width-to-depth ratio and change of riverbed profile. On this base, this thesis studies the impact of the change riverbed profile on the Jingjiang channel condition. The laws of morphology variation of different sections in Jingjiang river are proved to be different after TGR operation, yet common features among these laws are clearly represented by upstream water sediment variation-deduced point bar scouring, river-width expansion, and contraction decline,as well as the decrease of degree of curve under the same flow. Under the impact of release of water these changes will be sustainable development. The nearshore scouring and the width of river channel increase are still the main forms and features. Moreover, these changes may bring about some unfavorable effects on Jingjiang channel condition.