Based on the analysis of the plane configuration characteristics of 25 main curved channels in Yibin-Chongqing reach of the upper Yangtze River，we probes into the changing rules of characteristic parameters as follows:the curved reach expanding rate，shrinkage rate，bending，bend angle at centre，ratio between swan river width and average river width，ratio between radius of center at curved top and average river width of characteristic value change rule.The results show that most curved channels are narrow at both ends and wide in the middle part，some curved channels are sharp bend and very apparent broadening and sag;the bend angles in the centre are between 60°and 130°，and most bends’ central angle is greater than or equal to 90 °;the sinuosity of most curved channels is over 1.20.The navigation-obstructing characteristics and forming mechanism of the bend plane morphology are also analyzed.The above results may serve as reference for the planning and construction of port and waterway engineering，hydraulic engineering，municipal engineering and ecological engineering，etc.