Abstract: Bars are one of the important geomorphic features in rivers. Studying the changes and morphological characteristics of bars can provide basic information for understanding the evolution of rivers. The valley of the middle section of the Yarlung Tsangpo River exhibits an alternating pattern of wide and narrow segments, with the braided channel features being prominent in the wide valley sections. The braided river channels are characterized by a complex network of meandering channels and numerous bars and point bars. The evolution of these river bars is also highly complex. To probe the evolution patterns of bars in the typical braided river channel of the middle reaches of the Yarlung Tsangpo River, this study focuses on the Zaxi Raodeng-Paizhen braided river section in the middle and lower reaches of the Yarlung Tsangpo River. Based on 21 Landsat satellite images in November from 1986 to 2022 and utilized ArcGIS software to extract and analyze the characteristic parameters of bars within this specific river segment. In addition, the analysis incorporated morphological index and fragmentation index to examine the area characteristics and planform changes of the bars. The research findings indicate that in the Zaxi Raodeng-Paizhen river section, 80% of the bars area less than 1 km2, while only 1-3 bars area larger than 5 km2, accounting for 1% to 2% of the total number of bars. Additionally, there is a significant difference in the area between bars. During the period from 1986 to 2022, the number and area of bars in the Zaxi Raodeng-Paizhen River section have shown no significant trend or abrupt change. The overall variations range are very small.Separated the study reaches at the confluence of the Niyang River to Yarlung Tsangpo River, the bars in the upstream section are more fragmented and scattered in their distribution. These bars predominantly consist of small-sized bars and the morphology of the bars tends to be short and wide. Over the years, the upstream section river dynamics have been relatively stable, and the distribution and morphology of the bars have shown small changes over time. In the downstream section of the river, the distribution of bars is relatively concentrated. These bars mainly consist of large expanse shoals, and their morphology tends to be elongated in shape. Over the years, there have been significant changes in the river′s dynamics, and there have been significant changes in both the distribution and morphological characteristics of the bars. Generally, the morphology of bars in the downstream section of the river has undergone more noticeable changes compared to the upper reaches. The study has elucidated the characteristics of bars in the Zaxi Raodeng-Paizhen River section of the middle and lower reaches of the Yarlung Tsangpo River, as well as their long-term morphological changes. The conclusions drawn from this study can provide some references for river management and engineering development in the middle and lower reaches of the Yarlung Tsangpo River.