Bromine is one of the important chemical raw materials in China, with important research and application value in environmental science and industrial fields. In recent years, with the bullish market of chemical products such as bromine flame retardants and bromine salts, the demand for bromine will continue to grow. The chemical composition of brine in Tibetan Salt Lakes has always attracted much attention, of which the content of bromine (Br) is also an important indicator. However, at present, there is little research on the distribution of bromine (Br) in Tibetan Salt Lakes and the content characteristics and significance of bromine in the evaporation process. This paper takes Tibetan Salt Lakes as the research object, studies the content characteristics of bromine in brine, and discusses its changes in the evaporation process. The research shows that: ①The bromine content in the brine of Tibetan Salt Lakes is 0.11~187.03mg/L, and most of the salt lakes are rich in Br, such as Zhacangchaka (52.90mg/L) and Nieercuo (52.03mg/L), whose Br content is higher than the comprehensive evaluation index of bromine (50mg/L); The Br content in the brine of Zhabuye North Lake (187.03mg/L), Zhabuye South Lake (177.80mg/L), and Dangxiongcuo Salt Lake (106.62mg/L) is higher than the boundary grade of bromine in Zhabuye Salt Lake (100mg/L). Within a year, Zhabuye North Lake and South Lake have the highest bromine content in November and December, with 212.23mg/L and 272.78mg/L, respectively; In July and August, the highest bromine content was found in Dangxiongcuo, with a maximum of 130.00mg/L; ②The main source of Br supply in salt lake brine is strongly active hot springs, which converge through river water and accumulate in salt lake brine. Among them, about 99% of Br supply in Jiezechaka salt lake brine comes from riverside hot springs; ③Although the Br content in salt lake brine is far lower than that in seawater, the Br content in salt field brine, such as in various levels of salt fields in Zhabuye, is significantly higher than the industrial extraction grade (300mg/L). During the natural evaporation and concentration process of brine, the content of Br gradually increases with the increase of evaporation rate. The concentration of bromine in the brine of Zhabuye Salt Lake increases from 90.00mg/L of the original brine to 420.00mg/L when the evaporation rate is 79%; When the concentration of bromine in the brine of Dangxiongcuo Salt Lake increased from 107.40mg/L of the original brine to a evaporation loss rate of 84%, it was concentrated to 303.50mg/L. Salt lakes and salt field brine with high bromine content are potential resources for the comprehensive development and utilization of bromine.