The geometrical morphology of river network and braided rivers in the source region of Yangtze River is unique and distinctive. In this study,the longitudinal profiles of 22 rivers in the source region of the Yangtze River were extracted which were based on SRTM3 DEM (resolution 90 m) ,the Landsat 4 - 5 TM remote sensing image, and Google Earth satellite imagery data,and a simple mathematical function (linear,exponential,logarithmic,and power function) was used to fit the longitudinal profiles,and the internal relationship between tectonic activity and development of different river longitudinal profile was analyzed based on the Hack profile,concavity index,and river slope parameter SL index etc. The results showed that the best fitting shape of the most river longitudinal profile in the source region of Yangtze River was exponential function (R~2≥0. 99) ,which confirmed that the riverbed erosion was much strong in this area indirectly. The concavity index value of the 22 branches were about 1. 0,which Dangqu River was the largest,and Sewuqu River was the lowest. Thus,the concavity index corresponded to the morphological characteristics of the longitudinal profile of the river,belonging to the high and extreme value. In the statistical results of the river morphology,all Hack profiles of the three sources were curves and the Tuotuo-Tongtian River,Dangqu River and Chumaer River were respectively appeared 8 times,4 times, and 3 times of the torose form with alternate width where the broad valley was the braided river and the canyon was confined section. The standard river slope index SL /K was between 2 ~ 10,indicating that the river was in the steep river and the tectonic activity was strong. Except the influence of climate change and bedrock properties,the new tectonic movement had played a leading role in the longitudinal profile evolution of the Yangtze River since the late Pleistocene.